Кардизем инструкция по применению

diltiazem will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Concomitant use with amlodipine and diltiazem reported an a 60% increase in amlodipine AUC. Monitor increased effects and toxicities (eg, bradycardia, sinus arrest, decreased cardiac output) if amiodarone is concomitantly used with nondihydropyridine calcium channel blocker (ie, diltiazem).

apalutamide will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of apalutamide, a strong CYP3A4 inducer, with drugs that are CYP3A4 substrates can result in lower exposure to these medications. Avoid or substitute another drug for these medications when possible. Evaluate for loss of therapeutic effect if medication must be coadministered. Adjust dose according to prescribing information if needed.

diltiazem will increase the level or effect of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Moderate CYP3A4 inhibitors may increase serum concentrations and/or toxicities of aprepitant.

diltiazem, atenolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem will increase the level or effect of avapritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of avapritinib with moderate CYP3A4 inhibitors. If unable to avoid, reduce avapritinib starting dose. See drug monograph Dosage Modifications.

diltiazem, betaxolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem, bisoprolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem increases levels of bosutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of budesonide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid concomitant use of CYP3A4 inhibitors and oral budesonide. If coadministration is necessary, closely monitor for signs and symptoms of corticosteroid excess.

ceritinib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

clonidine, diltiazem. unknown mechanism. Avoid or Use Alternate Drug. Reports of sinus bradycardia resulting in hospitalization and pacemaker insertion reported with concomitant use. Possible life-threatening effect, monitor closely.

diltiazem will increase the level or effect of cobimetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concurrent short term (=14 days) use of moderate CYP3A inhibitors is unavoidable for patients who are taking cobimetinib 60 mg, reduce cobimetinib dose to 20 mg. After discontinuing the moderate CYP3A inhibitor, resume cobimetinib 60 mg. In patients who are already receiving reduced cobimetinib doses due to adverse reactions, avoid moderate CYP3A4 and use alternative therapy.

diltiazem will increase the level or effect of colchicine by Other (see comment). Avoid or Use Alternate Drug. Colchicine is a P-gp and CYP3A4 substrate. Avoid use with drugs that are both P-gp and strong CYP3A4 inhibitors. If coadministration is necessary, decrease colchicine dose or frequency as recommended in prescribing information. Use of any colchicine product in conjunction with strong CYP3A4 inhibitors is contraindicated in patients with renal or hepatic impairment.

diltiazem will increase the level or effect of copanlisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Monitor patients for increased copanlisib effects/toxicities if coadministered with diltiazem. Consider reducing copanlisib dose to 45 mg.

diltiazem will increase the level or effect of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Use lower starting doses of nondihydropyridine calcium channel blockers (eg,l, diltiazem). Consider increasing calcium channel blocker dose after combination is being well-tolerated.

diltiazem will increase the level or effect of elacestrant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid concomitantly use of eletriptan and moderate CYP3A4 inhibitors for 72 hours.

diltiazem increases levels of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Moderate CYP3A4 inhibitors are not recommended with eliglustat poor or intermediate metabolizers; reduce eliglustat dose from 84 mg BID to 84 mg once daily in extensive metabolizers .

diltiazem will increase the level or effect of encorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If concomitant use of a moderate CYP3A4 inhibitor is unavoidable, reduce encorafenib dose to one-half of the dose (eg, reduce from 450 mg/day to 225 mg/day). After discontinuing the inhibitor for 3-5 elimination half-lives, resume previous encorafenib dose.

diltiazem will increase the level or effect of entrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of moderate CYP3A4 inhibitors with entrectinib, a CYP3A4 substrate. If coadministration unavoidable, reduce dose to 200 mg/day for patients aged 12 y or older with BSA >1.50m2. Resume previous entrectinib dose after discontinuing moderate CYP3A inhibitor for 3-5 elimination half-lives.

enzalutamide will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of eplerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of eplerenone and mdoerate CYP3A4 inhibitor is not recommended. If combination is unavoidable, eplerenone dose should not exceed 25 mg/day for patients with congestive heart failure following MI.

erdafitinib will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If coadministration unavoidable, separate administration by at least 6 hr before or after administration of P-gp substrates with narrow therapeutic index.

diltiazem will increase the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.erythromycin base will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider an alternative to erythromycin in patients receiving diltiazem. If no alternative is available, monitor for the effects of diltiazem following erythromycin initiation/discontinuation.

erythromycin ethylsuccinate will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider an alternative to erythromycin in patients receiving diltiazem. If no alternative is available, monitor for the effects of diltiazem following erythromycin initiation/discontinuation.diltiazem will increase the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

erythromycin lactobionate will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider an alternative to erythromycin in patients receiving diltiazem. If no alternative is available, monitor for the effects of diltiazem following erythromycin initiation/discontinuation.diltiazem will increase the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

erythromycin stearate will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Consider an alternative to erythromycin in patients receiving diltiazem. If no alternative is available, monitor for the effects of diltiazem following erythromycin initiation/discontinuation.diltiazem will increase the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem, esmolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

fexinidazole will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Fexinidazole inhibits CYP3A4. Coadministration may increase risk for adverse effects of CYP3A4 substrates.

diltiazem will increase the level or effect of fosaprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Moderate CYP3A4 inhibitors may increase serum concentrations and/or toxicities of aprepitant.

diltiazem increases levels of ibrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration with moderate CYP3A4 inhibitors, reduce ibrutinib dose to 280 mg qDay (B-cell malignancies) or 420 mg qDay (graft versus host disease). After CYP3A inhibitor discontinuation, resume previous dose of ibrutinib.

idelalisib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Idelalisib is a strong CYP3A inhibitor; avoid coadministration with sensitive CYP3A substrates

diltiazem will increase the level or effect of infigratinib (DSC) by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of ivabradine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of ivabradine with moderate CYP3A4 inhibitors.diltiazem, ivabradine.
Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Most patients receiving ivabradine will also be treated with a beta-blocker. The risk of bradycardia increases with coadministration of drugs that slow heart rate (eg, digoxin, amiodarone, beta-blockers). Monitor heart rate in patients taking ivabradine with other negative chronotropes.

diltiazem will increase the level or effect of ivosidenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration with moderate CYP3A4 inhibitors may increase ivosidenib plasma concentrations, thus increasing the risk of QTc prolongation. Monitor for increased risk of QTc interval prolongation.ivosidenib will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sensitive CYP3A4 substrates with ivosidenib or replace with alternate therapies. If coadministration is unavoidable, monitor patients for loss of therapeutic effect of these drugs.

landiolol, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Coadministration of beta blockers with other negative inotropes or chronotropes may augment myocardial contractility depression and increase risk of bradycardia or heart block.

lasmiditan increases levels of diltiazem by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of lemborexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of lemborexant with moderate or strong CYP3A inhibitors.

diltiazem, levobunolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

lofexidine, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid coadministration with other drugs that decrease pulse or blood pressure to mitigate risk of excessive bradycardia and hypotension.

lopinavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

lorlatinib will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of lovastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Do not exceed 20 mg/day of lovastatin

diltiazem will increase the level or effect of lurbinectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem, mavacamten.
Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Expect additive negative inotropic effects of mavacamten and other drugs that reduce cardiac contractility.

diltiazem, metoprolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem will increase the level or effect of midazolam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of moderate CYP3A4 inhibitors with midazolam intranasal causes higher midazolam systemic exposure, which may prolong sedation.

diltiazem will increase the level or effect of midostaurin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong CYP3A4 inhibitors cannot be avoided, monitor midostaurin for increased risk of adverse reactions, especially during the first week of treatment.

diltiazem, nadolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem will increase the level or effect of naloxegol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministation of naloxegol with moderate CYP3A4 inhibitors is unavoidable, reduce naloxegol dose to 12.5 mg qDay

diltiazem, nebivolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem will increase the level or effect of neratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of neratinib with strong/moderate CYP3A4 inhibitors.

diltiazem will increase the level or effect of nirogacestat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of olaparib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with moderate CYP3A inhibitors cannot be avoided, reduce olaparib dose to 200 mg (capsule) or 150 mg (tablet) PO BID. Do not substitute tablets with capsules.

diltiazem will increase the level or effect of omaveloxolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If unavoidable, reduce omaveloxolone dose to 100 mg/day. Closely monitor for adverse effects. If adverse effects emerge, further reduce to 50 mg/day.

diltiazem will increase the level or effect of pacritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of pemigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors is unavoidable, reduce pemigatinib dose (refer to drug monograph dosage modifications). After discontinuing the CYP3A4 inhibitor for 3 elimination half-lives, may resume previous pemigatinib dose.

diltiazem will increase the level or effect of pexidartinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors is unavoidable, reduce pexidartinib dose (refer to drug monograph dosage modifications). After discontinuing the CYP3A4 inhibitor for 3 elimination half-lives, may resume previous pexidartinib dose.

ponesimod, diltiazem.
Either increases effects of the other by QTc interval. Avoid or Use Alternate Drug. Consult cardiologist if considering treatment. Generally, should not be initiated in patients who are concurrently taking QT prolonging drugs with known arrhythmogenic properties, such as HR-lowering calcium channel blockers (eg, verapamil, diltiazem).

primidone will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of propafenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of diltiazem with pimozide may increase the serum concentration of pimozide (eg, ventricular tachycardia, torsade de pointes, cardiac arrest, sudden death).

diltiazem, propranolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem will increase the level or effect of repotrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Discontinue strong or moderate CYP3A inhibitors and wait 3-5 elimination half-lives before initiating repotrectinib.

rifampin will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration with diltiazem and strong CYP3A4 inducers However, if concomitant use is necessary, consider dosage adjustment and close monitoring of pharmacologic effects (eg, blood pressure) whenever a strong CYP3A4 inducer is added to or discontinued from therapy.

diltiazem will increase the level or effect of selumetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If coadministration with strong or moderate CYP3A4 inhibitors cannot be avoided, reduce selumetinib dosage (refer to selumetinib monograph for further information). After discontinuation of the strong or moderate CYP3A4 inhibitor for 3 elimination half-lives, resume selumetinib dose that was taken before initiating the inhibitor.

diltiazem will increase the level or effect of simvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Benefits of combination therapy should be carefully weighed against the potential risks of combination. Limit simvastatin dose to no more than 10 mg/day and dilitazem dose to no more than 240 mg/day when used concurrently.

siponimod, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Because of the potential additive effects on heart rate, siponimod should generally not be initiated in patients taking QT prolonging drugs with known arrhythmogenic properties, heart rate lowering calcium channel blockers, or other drugs that may decrease heart rate. If treatment considered, obtain cardiology consult regarding switching to non-heart-rate lowering drugs or appropriate monitoring for treatment initiation.diltiazem will increase the level or effect of siponimod by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of siponimod with a moderate or strong CYP3A4 inhibitor PLUS a moderate or strong CYP2C9 inhibitor is not recommended.

diltiazem will increase the level or effect of sonidegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of sonidegib with moderate CYP3A4 inhibitors. If a moderate CYP3A inhibitor must be used, administer the moderate CYP3A inhibitor for <14 days and monitor closely for adverse reactions, particularly musculoskeletal adverse reactions.

diltiazem, sotalol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

sotorasib will decrease the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If use is unavoidable, refer to the prescribing information of the P-gp substrate for dosage modifications.

St John’s Wort will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

diltiazem will increase the level or effect of tazemetostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration of tazemetostat with moderate CYP3A4 inhibitors. If coadministration is unavoidable, reduce tazemetostat current dose (see drug monograph Dosage Modifications).

tepotinib will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug. If concomitant use unavoidable, reduce the P-gp substrate dosage if recommended in its approved product labeling.

diltiazem, timolol.
Either increases toxicity of the other by unspecified interaction mechanism. Avoid or Use Alternate Drug. Can increase risk of bradycardia.

diltiazem will increase the level or effect of tolvaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. In patients taking concomitant moderate CYP3A inhibitors, reduce tolvaptan dose (see Prescribing Information). Consider further reductions if patients cannot tolerate the reduced dose. Interrupt tolvaptan temporarily for short term therapy with moderate CYP3A inhibitors if the recommended reduced doses are not available.

tucatinib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid concomitant use of tucatinib with CYP3A substrates, where minimal concentration changes may lead to serious or life-threatening toxicities. If unavoidable, reduce CYP3A substrate dose according to product labeling.

diltiazem will increase the level or effect of venetoclax by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If a moderate CYP3A inhibitor must be used, reduce the venetoclax dose by at least 50%. Monitor more closely for signs of venetoclax toxicities.

diltiazem increases levels of vilazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. If intolerable adverse effects occur when coadministered with moderate CYP3A4 inhibitors, reduce daily dose to 20 mg.

diltiazem will increase the level or effect of acalabrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce acalabrutinib dose to 100 mg once daily if coadministered with a moderate CYP3A inhibitor.

acebutolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

aldesleukin increases effects of diltiazem by pharmacodynamic synergism. Use Caution/Monitor. Risk of hypotension.

diltiazem will increase the level or effect of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. In patients receiving both diltiazem and alfentanil, monitor for alfentanil toxicity (sedation, somnolence, confusion, impaired coordination, diminished reflexes, coma). Doses of alfentanil may need to be reduced.

diltiazem will increase the level or effect of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased exposure to alfuzosin may be expected when alfuzosin is concomitantly used with diltiazem. Monitor pulse and blood pressure.

diltiazem will increase the level or effect of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for increased alprazolam side effects including drowsiness or fatigue, nausea, vomiting, diarrhea or constipation.

amifostine, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration with blood pressure lowering agents may increase the risk and severity of hypotension associated with amifostine. When amifostine is used at chemotherapeutic doses, withhold blood pressure lowering medications for 24 hr prior to amifostine; if blood pressure lowering medication cannot be withheld, do not administer amifostine.

diltiazem will increase the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor increased effects and toxicities (eg, bradycardia, sinus arrest, decreased cardiac output) if amiodarone is concomitantly used with nondihydropyridine calcium channel blocker (ie, diltiazem).

diltiazem will increase the level or effect of amitriptyline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use with amitriptyline may alter blood pressure control.

amlodipine and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

amobarbital will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem increases levels of apixaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Patients with renal impairment receiving apixaban with drugs that are combined P-gp and weak or moderate CYP3A4 inhibitors may have significant increases in exposure compared with patients with normal renal function and no inhibitor use, since both pathways of apixaban elimination are affected. Since these increases may increase bleeding risk, use apixaban in this situation only if the potential benefit justifies the potential risk.

aprepitant will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Closely monitor when aripiprazole is used with a moderate CYP3A4 inhibitor, due to potential risks for increased aripiprazole systemic exposure and effects. Refer to drug monograph for specific dosing modifications are dependent on indication, genotype, and drug formulation.

diltiazem will increase the level or effect of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.armodafinil will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

artemether/lumefantrine will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem will increase the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration with artemether/lumefantrine may increase artemether/lumefantrine levels and toxicities (eg, cardiac arrhythmias).

asenapine and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

atazanavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of atazanavir with diltiazem may increase diltiazem levels and toxicities (eg, hypotension, AV block). Consider reducing diltiazem dose by 50%. Monitor blood pressure and ECG.

atenolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of atogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of atorvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concurrent therapy is required, monitor for signs and symptoms of myopathy or rhabdomyolysis (muscle pain, tenderness, or weakness, or discolored urine). If myopathy or rhabdomyolysis is diagnosed or suspected, monitor creatine kinase (CK) levels and discontinue use if CK levels show a marked increase.

diltiazem will increase the level or effect of avanafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Moderate CYP3A4 inhibitors may reduce avanafil clearance increasing systemic exposure to avanafil; increased levels may result in increased associated adverse events; maximum recommended dose of avanafil is 50 mg over 24 hours for patients taking concomitant moderate CYP3A4 inhibitors.

diltiazem increases levels of axitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration with moderate CYP3A4 inhibitors, monitor closely and reduce dose if necessary .

diltiazem will increase the level or effect of bazedoxifene/conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

belzutifan will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration of belzutifan with sensitive CYP3A4 substrates, consider increasing the sensitive CYP3A4 substrate dose in accordance with its prescribing information.

benzgalantamine, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Galantamine, an acetylcholinesterase inhibitor, has vagotonic effects on the SA and AV nodes, leading to bradycardia. Consider consulting a cardiolist before initiating other drugs that may cause bradycardia.

benzphetamine will decrease the level or effect of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor. Amphetamines may diminish antihypertensive effects of diltiazem. Monitor BP.

berotralstat will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor or titrate P-gp substrate dose if coadministered.

betaxolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

bisoprolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of bortezomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant use with bortezomib may potentiate the risk of hypotension. Monitor BP.

diltiazem will decrease the level or effect of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.bosentan will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem, bretylium.
Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Each drug may cause hypotension.

diltiazem will increase the level or effect of brexpiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Administer a quarter of brexpiprazole dose if coadministered with a moderate CYP3A4 inhibitor PLUS a strong/moderate CYP2D6 inhibitor.

diltiazem will increase the level or effect of buprenorphine subdermal implant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor patients already on buprenorphine subdermal implant who require newly-initiated treatment with CYP3A4 inhibitors for signs and symptoms of overmedication. If the dose of the concomitant CYP3A4 inhibitor cannot be reduced or discontinued, implant removal may be necessary and the patient should then be treated with a buprenorphine dosage form that permits dose adjustments. If a CYP3A4 inhibitor is discontinued in a patient who has been stabilized on buprenorphine, monitor the patient for withdrawal.

diltiazem will increase the level or effect of buprenorphine, long-acting injection by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Patients who transfer to buprenorphine long-acting injection from transmucosal buprenorphine coadministered with CYP3A4 inhibitors should be monitored to ensure buprenorphine plasma levels are adequate. Within 2 weeks, if signs and symptoms of buprenorphine toxicity or overdose occur and the concomitant CYP3A4 inhibitor cannot be reduced or discontinued, transition the patient back to a buprenorphine formulation that permits dose adjustments.

diltiazem will increase the level or effect of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of buspirone with diltiazem may increase plasma concentrations and/or toxicities of buspirone. Dose adjustments may be necessary.

butabarbital will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

butalbital will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of cabazitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of cabozantinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

calcium acetate decreases effects of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor.

calcium carbonate decreases effects of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor.

calcium chloride decreases effects of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor.

calcium citrate decreases effects of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor.

calcium gluconate decreases effects of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor.

diltiazem will increase the level or effect of cannabidiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor increased cannabidol effects and toxicities if coadministered with moderate CYP3A4 inhibitors. Reduce cannabidiol dose if necessary.

carbamazepine will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

carvedilol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

celiprolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

cenobamate will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP3A4 substrate, as needed, when coadministered with cenobamate.

diltiazem will increase the level or effect of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Consider reducing cilostazol dose to 50 mg PO BID when administered with diltiazem.

cimetidine will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Consider alternatives to cimetidine in patients receiving diltiazem. If no alternative is available, monitor for the effects of diltiazem following cimetidine initiation/discontinuation.cimetidine will increase the level or effect of diltiazem by basic (cationic) drug competition for renal tubular clearance. Modify Therapy/Monitor Closely. Exercise caution when concomitantly using diltiazem with atazanavir. Consider reducing the diltiazem dose by 50%. ECG monitoring is recommended.

diltiazem will increase the level or effect of cinacalcet by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

clarithromycin will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Increased effect of calcium channel blockers may lead to hypotension, edema, decreased HR, and acute kidney injury due to reduced renal blood flow

clevidipine and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will decrease the level or effect of clopidogrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of clopidogrel and a calcium channel blocking agent may decrease the effect of clopidogrel on platelet inhibition, possibly increasing the risk of atherothrombotic events. Clopidogrel requires hepatic biotransformation to an active metabolite, mediated by the 3A4 enzyme. Diltiazem is a 3A4 inhibitor and may decrease the hepatic metabolism of clopidogrel to its active metabolite.

diltiazem will increase the level or effect of clozapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Concomitant treatment with clozapine and CYP2D6 or CYP3A4 inhibitors can increase clozapine levels and lead to adverse reactions. Use caution and monitor patients closely when using such inhibitors. Consider reducing clozapine dose.

cobicistat will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

conivaptan will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of conjugated estrogens, vaginal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of cortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

crizotinib increases levels of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.diltiazem increases levels of crizotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution should be exercised with concomitant use of moderate CYP3A inhibitors. .

diltiazem will increase the level or effect of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor serum cyclosporine concentrations if diltiazem or verapamil are initiated/ discontinued. During coadministration of cyclosporine and diltiazem, monitor for decreases in blood pressure.

dabrafenib will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

danazol will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

danicopan will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Danicopan increases plasma concentrations of P-gp substrates; consider dose reduction of P-gp substrates where minimal concentration changes may lead to serious adverse reactions.

diltiazem will increase the level or effect of daridorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Daridorexant dose should not exceed 25 mg per night when coadministered with moderate CYP3A4 inhibitors.

diltiazem will increase the level or effect of darifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

darunavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem will increase the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Consider avoiding the concomitant use of protease inhibitors and nondihydropyridine calcium channel blockers (CCB). Monitor for toxicities of the CCB if a protease inhibitor is initiated/dose increased.

diltiazem will increase the level or effect of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

deferasirox will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of deflazacort by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease deflazacort dose to one-third of the recommended dose if coadministered with moderate or strong CYP3A4 inhibitors.

diltiazem will increase the level or effect of dexamethasone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of diazepam buccal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong or moderate CYP3A4 inhibitors may decrease rate of diazepam elimination, thereby increasing adverse reactions to diazepam.

diltiazem will increase the level or effect of diazepam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong or moderate CYP3A4 inhibitors may decrease rate of diazepam elimination, thereby increasing adverse reactions to diazepam.

diltiazem will increase the level or effect of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of docetaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of donepezil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

doxazosin and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will increase the level or effect of doxorubicin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of doxorubicin liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

dronedarone will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Calcium channel blockers with depressant effects on sinus and AV nodes could potentiate dronedarone’s effects on conduction. Initiate calcium channel blockers at a lower dose and titrate up only after ECG verification of tolerability.

duvelisib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with duvelisib increases AUC of a sensitive CYP3A4 substrate which may increase the risk of toxicities of these drugs. Consider reducing the dose of the sensitive CYP3A4 substrate and monitor for signs of toxicities of the coadministered sensitive CYP3A substrate.

efavirenz will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

elagolix will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Elagolix is a weak-to-moderate CYP3A4 inducer. Monitor CYP3A substrates if coadministered. Consider increasing CYP3A substrate dose if needed.

elvitegravir/cobicistat/emtricitabine/tenofovir DF increases levels of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Exercise caution and monitor upon coadministration of calcium channel blockers with elvitegravir/cobicistat/emtricitabine/tenofovir DF.

encorafenib, diltiazem. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Encorafenib both inhibits and induces CYP3A4 at clinically relevant plasma concentrations. Coadministration of encorafenib with sensitive CYP3A4 substrates may result in increased toxicity or decreased efficacy of these agents.

diltiazem will increase the level or effect of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

eslicarbazepine acetate will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

esmolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of estradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of estrogens conjugated synthetic by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of estrogens esterified by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of estropipate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

etrasimod, diltiazem. pharmacodynamic synergism. Use Caution/Monitor. Transient decrease in heart rate and AV conduction delays may occur when initiating etrasimod. Concomitant use of etrasimod in patients receiving stable beta-blocker treatment did not result in additive effects on heart rate reduction. However, risk of additive heart rate reduction following initiation of beta-blocker therapy with stable etrasimod treatment or concomitant use with other drugs that may decrease heart rate is unknown. .

diltiazem will increase the level or effect of etravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.etravirine will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of everolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Dose adjustment is based on indication. In breast cancer, PNET, renal cell cancer, or renal angiomyolipoma w/ TSC patents, decrease everolimus dose to 2.5-5 mg/day; decrease everolimus dose 50% and monitor levels in SEGA patients.

fedratinib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.

diltiazem will increase the level or effect of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem and felodipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will increase the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration of CYP3A4 inhibitors with fentanyl is necessary, monitor patients for respiratory depression and sedation at frequent intervals and consider fentanyl dose adjustments until stable drug effects are achieved.

diltiazem will increase the level or effect of fentanyl intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration of CYP3A4 inhibitors with fentanyl is necessary, monitor patients for respiratory depression and sedation at frequent intervals and consider fentanyl dose adjustments until stable drug effects are achieved.

diltiazem will increase the level or effect of fentanyl transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration of CYP3A4 inhibitors with fentanyl is necessary, monitor patients for respiratory depression and sedation at frequent intervals and consider fentanyl dose adjustments until stable drug effects are achieved.

diltiazem will increase the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If coadministration of CYP3A4 inhibitors with fentanyl is necessary, monitor patients for respiratory depression and sedation at frequent intervals and consider fentanyl dose adjustments until stable drug effects are achieved.

diltiazem will increase the level or effect of fesoterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor serum potassium during initiation and dosage adjustment of either finererone or moderate CYP3A4 inhibitors. Adjust finererone dosage as needed.

diltiazem increases effects of fingolimod by pharmacodynamic synergism. Use Caution/Monitor. Both medications decrease heart rate. Monitor patients on concomitant therapy, particularly in the first 6 hours after fingolimod is initiated or after a treatment interruption of at least two weeks, for bradycardia and atrioventricular block. To identify underlying risk factors of bradycardia and AV block, obtain a new or recent ECG in patients using calcium channel blockers prior to starting fingolimod.

fluconazole will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

fluvoxamine will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Protease Inhibitors may decrease metabolism of diltiazem. Increased serum concentrations of diltiazem may increase risk of AV nodal blockade.fosamprenavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

fosaprepitant will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

foscarbidopa/foslevodopa increases effects of diltiazem by pharmacodynamic synergism. Use Caution/Monitor. Consider decreasing dosage of antihypertensive agent.

fosphenytoin will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem will increase the level or effect of fosphenytoin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for phenytoin toxicity if diltiazem is initiated/dose increased, or decreased phenytoin effects if diltiazem is discontinued/dose decreased. Monitor for reduced diltiazem therapeutic effects with concomitant fosphenytoin.

fostamatinib will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Concomitant use of fostamatinib may increase concentrations of P-gp substrates. Monitor for toxicities of the P-gp substrate drug that may require dosage reduction when given concurrently with fostamatinib.

galantamine, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Galantamine, an acetylcholinesterase inhibitor, has vagotonic effects on the SA and AV nodes, leading to bradycardia. Consider consulting a cardiolist before initiating other drugs that may cause bradycardia.

diltiazem will increase the level or effect of gepirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce gepirone dose by 50% when used concomitantly with a moderate CYP3A4 inhibitor.

glecaprevir/pibrentasvir will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

grapefruit will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

griseofulvin will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of guanfacine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce guanfacine ER dose by 50% when initiating concomitant therapy with a moderate CYP3A4 inhibitor. When discontinuing moderate CYP3A4 inhibitor, increase guanfacine dose to recommended dose range. Monitor for excessive guanfacine response (eg, hypotension, bradycardia, CNS depression).

hawthorn increases effects of diltiazem by pharmacodynamic synergism. Use Caution/Monitor.

diltiazem will increase the level or effect of hydrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will decrease the level or effect of ifosfamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Use of a CYP3A4 inhibitor may decrease metabolism of ifosfamide, potentially reducing ifosfamide therapeutic effects.

iloperidone increases levels of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Iloperidone is a time-dependent CYP3A inhibitor and may lead to increased plasma levels of drugs predominantly eliminated by CYP3A4. Coadministration with iloperidone may increase the risk for QT prolongation and patients should be carefully monitor.

iloprost, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. When administering iloprost IV, consider temporary discontinuation of concomitant vasodilators or other medications that reduce blood pressure to mitigate potential additive hypotensive effects. If hypotension persists despite discontinuing other antihypertensives and fluid resuscitation, consider iloprost dose reduction or discontinuation.

diltiazem will increase the level or effect of imatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of imipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of irinotecan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of isavuconazonium sulfate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem and isradipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

istradefylline will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials. This effect was not observed with istradefylline 20 mg/day. Consider dose reduction of sensitive CYP3A4 substrates.istradefylline will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of P-gp substrates in clinical trials. Consider dose reduction of sensitive P-gp substrates.

diltiazem will increase the level or effect of itraconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of diltiazem and itraconazole may increase both drug levels, toxities, and additive negative inotropic effects.itraconazole will increase the level or effect of diltiazem by Other (see comment). Modify Therapy/Monitor Closely. CCBs elicit negative inotropic effects which may be additive to those of itraconazole; additionally, itraconazole can inhibit the metabolism of calcium channel blockers. Monitor for adverse reactions. Concomitant drug dose reduction may be necessary.

diltiazem will increase the level or effect of ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce ivacaftor dose if coadministered with moderate CYP3A4 inhibitors. See specific ivacaftor-containing product for precise dosage modification.

diltiazem will increase the level or effect of ixabepilone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of ketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of diltiazem and ketoconazole may increase both drug levels, toxities, and additive negative inotropic effects.ketoconazole will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

labetalol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of larotrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem increases effects of lasmiditan by pharmacodynamic synergism. Use Caution/Monitor. Lasmiditan has been associated with a lowering of heart rate (HR). In a drug interaction study, addition of a single 200-mg dose of lasmiditan to propranolol decreased HR by an additional 5 bpm compared to propranolol alone, for a mean maximum of 19 bpm.

diltiazem will increase the level or effect of lefamulin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for adverse effects if lefamulin is coadministered with moderate CYP3A inhibitors.

lenacapavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lencapavir (a moderate CYP3A4 inhibitor) may increase CYP3A4 substrates initiated within 9 months after last SC dose of lenacapavir, which may increase potential risk of adverse reactions of CYP3A4 substrates.

diltiazem will increase the level or effect of letermovir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of levamlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with moderate and strong CYP3A inhibitors results in increased systemic exposure to amlodipine and may require dose reduction. Monitor for symptoms of hypotension and edema when amlodipine is coadministered with CYP3A inhibitors to determine the need for dose adjustment.

levodopa increases effects of diltiazem by pharmacodynamic synergism. Use Caution/Monitor. Consider decreasing dosage of antihypertensive agent.

levoketoconazole will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.diltiazem will increase the level or effect of levoketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of diltiazem and ketoconazole may increase both drug levels, toxities, and additive negative inotropic effects.

diltiazem increases toxicity of lithium by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of neurotoxicity.

diltiazem will increase the level or effect of lopinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of lumateperone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce lumateperone dose to 21 mg/day if coadministered with moderate CYP3A4 inhibitors.

diltiazem will increase the level or effect of lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.lumefantrine will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem increases levels of lurasidone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease starting dose of lurasidone to 20 mg/day and maximum daily dose of lurasidone 80 mg when coadministered with moderate CYP3A4 inhibitors. Concurrent use may increase risk of lurasidone-related adverse reactions.

magnesium supplement, diltiazem.
Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Calcium channel blockers may increase toxic effects of magnesium; magnesium may increase hypotensive effects of calcium channel blockers.

diltiazem will increase the level or effect of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of marijuana by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of mavorixafor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor for mavorixafor adverse effects if coadministered with a moderate CYP3A4 inhibitor. If necessary, reduce mavorixafor daily dose. mavorixafor will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Caution if mavorixafor (a P-gp inhibitor) is coadministered with a sensitive P-gp substrate where minimal substrate concentration changes may lead to serious adverse effects.

mefloquine increases levels of diltiazem by decreasing metabolism. Use Caution/Monitor. Risk of arrhythmia.diltiazem will increase the level or effect of mefloquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem decreases effects of metformin by pharmacodynamic antagonism. Use Caution/Monitor. Patient should be closely observed for loss of blood glucose control; when drugs are withdrawn from a patient receiving metformin, patient should be observed closely for hypoglycemia.

diltiazem will increase the level or effect of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

methamphetamine will decrease the level or effect of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor. Amphetamines may diminish antihypertensive effects of diltiazem. Monitor BP.

methylphenidate will decrease the level or effect of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor. Methylphenidate may diminish antihypertensive effects. Monitor BP.

diltiazem will increase the level or effect of methylprednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

metoprolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Midazolam dose adjustments may be necessary in patients receiving concomitant diltiazem and midazolam. Monitor for signs of midazolam toxicity (eg, sedation, somnolence, confusion, impaired coordination, diminished reflexes, coma).

diltiazem will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of mifepristone, CYP3A4 inhibitor with diltiazem, CYP3A4 substrate may increase plasma concentrations of diltiazem. Discontinuation or dose reduction of diltiazem may be necessary with mifepristone coadministration.mifepristone will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem increases levels of mitapivat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Monitor Hb if mitapivat is coadministered with moderate CYP3A inhibitors. Do NOT titrate mitapivat dose beyond 20 mg BID.

mitotane decreases levels of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

moxisylyte and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

nadolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

nafcillin will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem increases levels of naldemedine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor naldemedine for potential adverse effects if coadministered with strong or moderate CYP3A4 inhibitors.

nebivolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

nefazodone will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of nelfinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor potential serious and/or life threatening reactions such as cardiac arrhythmias.nelfinavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

nevirapine will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Nondihydropyridine calcium channel blockers (CCB) may increase the serum concentration of dihydropyridine CCB. Monitor for toxicities of dihydropyridine CCB if diltiazem are initiated/dose increased, or decreased effects if diltiazem are discontinued/dose decreased.diltiazem and nicardipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will increase the level or effect of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Exercise caution when coadministering diltiazem and nifedipine and consider reducing nifedipine dose.nifedipine will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem and nifedipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will increase the level or effect of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.nilotinib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of nimodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

nirmatrelvir/ritonavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Consider reducing diltiazem dose by 50% during coadministration and for 3 more days after the last nirmatrelvir/ritonavir dose.

diltiazem will increase the level or effect of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem and nisoldipine both increase anti-hypertensive channel blocking. Use Caution/Monitor.

nitroglycerin rectal, diltiazem.
Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Marked orthostatic hypotension has been reported when calcium channel blockers and organic nitrates were used concomitantly. Observe for possible additive hypotensive effects during concomitant use. .

diltiazem increases effects of nitroprusside sodium by pharmacodynamic synergism. Use Caution/Monitor.

diltiazem will increase the level or effect of norgestrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Strong or moderate CYP3A4 inhibitors may increase systemic concentration of norgestrel, which may increase risk for adverse effects

olanzapine/samidorphan increases effects of diltiazem by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Monitor blood pressure and reduce antihypertensive drug dosage in accordance with its product labeling.

diltiazem will increase the level or effect of oliceridine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If concomitant use is necessary, may require less frequent oliceridine dosing. Closely monitor for respiratory depression and sedation and titrate subsequent doses accordingly. If inhibitor is discontinued, consider increase oliceridine dosage until stable drug effects are achieved. Monitor for signs of opioid withdrawal.

ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of oxybutynin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of oxycodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for dose-related toxicities (eg, diarrhea, mucositis, myelosuppression, peripheral neuropathy) of paclitaxel during coadministration.

diltiazem will increase the level or effect of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor for dose-related toxicities (eg, diarrhea, mucositis, myelosuppression, peripheral neuropathy) of paclitaxel during coadministration.

diltiazem will increase the level or effect of palbociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of palovarotene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid coadministration of palovarotene, a CYP3A substrate, with moderate CYP3A inhibitors. If unavoidable, reduce palovarotene dose by 50%.

diltiazem will increase the level or effect of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

pentobarbital will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

phendimetrazine will decrease the level or effect of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor. Amphetamines may diminish antihypertensive effects of diltiazem. Monitor BP.

phenobarbital will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

phenoxybenzamine and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

phentermine will decrease the level or effect of diltiazem by pharmacodynamic antagonism. Use Caution/Monitor. Amphetamines may diminish antihypertensive effects of diltiazem. Monitor BP.

phentolamine and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

phenytoin will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

pindolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of pioglitazone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

posaconazole will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

prazosin and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will increase the level or effect of prednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Closely monitor for evidence of excessive response to corticosteroid therapy if used with diltiazem. Consider dosage adjustment if necessary.

diltiazem will increase the level or effect of prednisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Closely monitor for evidence of excessive response to corticosteroid therapy if used with diltiazem. Consider dosage adjustment if necessary.

propranolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.quinidine will increase the level or effect of diltiazem by basic (cationic) drug competition for renal tubular clearance. Use Caution/Monitor.

diltiazem will increase the level or effect of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Limit the dose of ranolazine to a maximum of 500 mg twice a day when used concomitantly with diltiazem.

diltiazem will increase the level or effect of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Monitor glucose and hypoglycemic symptoms (eg, headache, dizziness, drowsiness, nervousness, confusion, tremor, hunger, weakness, perspiration, palpitations).

ribociclib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

rifabutin will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration with diltiazem and rifamycin derivatives may decrease diltiazem levels. Consider dosage adjustment and close monitoring of pharmacologic effects (eg, blood pressure) whenever a rifamycin derivative is added to or discontinued from therapy.

rifapentine will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration with diltiazem and rifamycin derivatives may decrease diltiazem levels. Consider dosage adjustment and close monitoring of pharmacologic effects (eg, blood pressure) whenever a rifamycin derivative is added to or discontinued from therapy.

diltiazem will increase the level or effect of rimegepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Avoid repeating rimegepant dose within 48 hr if coadministered with a moderate CYP3A4 inhibitor.

riociguat, diltiazem.
Either increases effects of the other by anti-hypertensive channel blocking. Use Caution/Monitor. Monitor patients closely for additive hypotensive effects if two or more of these agents are combined.

diltiazem will increase the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.ritonavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem increases levels of rivaroxaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Patients with renal impairment receiving rivaroxaban with drugs that are combined P-gp and weak or moderate CYP3A4 inhibitors may have significant increases in exposure compared with patients with normal renal function and no inhibitor use, since both pathways of rivaroxaban elimination are affected. Since these increases may increase bleeding risk, use rivaroxaban in this situation only if the potential benefit justifies the potential risk.

rucaparib will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

rufinamide will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of ruxolitinib topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

sarecycline will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Monitor for toxicities of P-gp substrates that may require dosage reduction when coadministered with P-gp inhibitors.

diltiazem will increase the level or effect of saxagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Closely monitor glucose when saxagliptin is concomitantly used with moderate CYP3A4 inhibitors.

diltiazem increases levels of seladelpar by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Caution in patients who are poor CYP2C9 metabolizers taking seladelpar and are coadministered a moderate/strong CYP3A4 inhibitor.

shepherd’s purse, diltiazem. Other (see comment). Use Caution/Monitor.
Comment: Theoretically, shepherd’s purse may interfere with BP control.

diltiazem will increase the level or effect of sildenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of silodosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.silodosin and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will increase the level or effect of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem, sodium sulfate/?magnesium sulfate/potassium chloride.
Either decreases toxicity of the other by unknown mechanism. Use Caution/Monitor. Monitor for hypotension or muscle weakness in patients receiving calcium channel blockers with elevated serum magnesium concentrations.

diltiazem, sodium sulfate/potassium sulfate/magnesium sulfate.
Either decreases toxicity of the other by unknown mechanism. Use Caution/Monitor. Monitor for hypotension or muscle weakness in patients receiving calcium channel blockers with elevated serum magnesium concentrations.

diltiazem will increase the level or effect of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

sotalol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of sparsentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. No dosage adjustment needed. Monitor blood pressure, serum potassium, edema, and kidney function regularly if sparsentan is coadministered with moderate CYP3A4 inhibitors.

stiripentol, diltiazem. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP3A4 inhibitor and inducer. Monitor CYP3A4 substrates coadministered with stiripentol for increased or decreased effects. CYP3A4 substrates may require dosage adjustment.

diltiazem will increase the level or effect of sufentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. The incidence and degree of bradycardia and hypotension during induction with sufentanil citrate may be greater in patients on chronic calcium channel and beta blocker therapy.

diltiazem will increase the level or effect of sufentanil SL by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Coadministration of sufentanil SL with any CYP3A4 inhibitor may increase sufentanil plasma concentration, and, thereby increase or prolonged adverse effects, including potentially fatal respiratory depression.

diltiazem will increase the level or effect of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of suvorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Decrease suvorexant starting dose to 5 mg HS if coadministered with moderate CYP3A4 inhibitors

diltiazem increases levels of suzetrigine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce suzetrigine dose if coadministered with moderate CYP3A inhibitors. .

diltiazem will increase the level or effect of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of tadalafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Risk of hypotension.

diltiazem, tamoxifen. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inhibition decreases metabolism of tamoxifen to N-desmethyl tamoxifen (active metabolite with similar biologic activity).

diltiazem increases levels of tamsulosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Dose reduction may be needed for coadministered drugs that are predominantly metabolized by CYP3A.

tazemetostat will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

tecovirimat will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

diltiazem will increase the level or effect of temsirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.diltiazem increases toxicity of temsirolimus by Other (see comment). Use Caution/Monitor.
Comment: Combination of mTOR inhibitors with calcium channel blockers increases risk of angioedema.

terazosin and diltiazem both increase anti-hypertensive channel blocking. Use Caution/Monitor.

diltiazem will increase the level or effect of tezacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. When tezacaftor/ivacaftor is combined with moderate CYP3A4 inhibitors, administer tezacaftor/ivacaftor (100 mg/150 mg) in the morning, every other day. Administer ivacaftor 150 mg alonein the evening, every other day, on alternate days from tezacaftor/ivacaftor.

diltiazem will increase the level or effect of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

timolol and diltiazem both increase anti-hypertensive channel blocking. Modify Therapy/Monitor Closely.

diltiazem will increase the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.tipranavir will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem increases levels of tofacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. No specific dose adjustment recommended when tofacitinib coadministered with moderate CYP3A4 inhibitors; decrease tofacitinib dose if coadministered with both moderate CYP3A4 and potent CYP2C19 inhibitors.

diltiazem will increase the level or effect of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

topiramate will decrease the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of trabectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of triamcinolone acetonide injectable suspension by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

trimagnesium citrate anhydrous, diltiazem.
Either increases effects of the other by Other (see comment). Use Caution/Monitor.
Comment: Possible additive effect of magnesium and calcium channel blockers on reduction of ionic calcium may increase risk of hypotension or muscle weakness.

diltiazem will increase the level or effect of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

tucatinib will increase the level or effect of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor. Consider reducing the dosage of P-gp substrates, where minimal concentration changes may lead to serious or life-threatening toxicities.

diltiazem increases levels of vanzacaftor/tezacaftor/deutivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce vanzacaftor/tezacaftor/deutivacaftor dose if coadministered with strong or moderate CYP3A inhibitors.

diltiazem will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Vardenafil dose may need to be reduced if coadministered with moderate or strong CYP3A4 inhibitors

vemurafenib increases levels of diltiazem by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

diltiazem will increase the level or effect of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.verapamil will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. These agents have additive hypotensive effects that may be beneficial however, it is important to monitor patients carefully.diltiazem and verapamil both increase anti-hypertensive channel blocking. Use Caution/Monitor. Antihypertensives may enhance the hypotensive effects of other antihypertensive agents when used together.

diltiazem will increase the level or effect of vinblastine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of vincristine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of vinorelbine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

diltiazem will increase the level or effect of voclosporin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce voclosporin daily dosage to 15.8 mg PO in AM and 7.9 mg PO in PM.

voriconazole will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Combo may increase risk of hypotension, bradycardia, AV block.voriconazole increases levels of diltiazem by decreasing metabolism. Use Caution/Monitor.

xipamide increases effects of diltiazem by pharmacodynamic synergism. Use Caution/Monitor.

diltiazem will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Reduce zanubrutinib (a CYP3A4 substrate) to 80 mg PO BID to when coadministered with a moderate CYP3A4 inhibitor. Interrupt dose as recommended for adverse reactions. After discontinuing the CYP3A4 inhibitor, resume previous dose of zanubrutinib.