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| __NOTOC__
| | #REDIRECT [[Diltiazem#Drug Interactions]] |
| {{Diltiazem}}
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| {{CMG}}; {{AE}} {{AK}}
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| ==Drug Interactions==
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| Due to potential for additive effects, caution is warranted in patients receiving diltiazem hydrochloride injection concomitantly with other agent(s) known to affect cardiac contractility and/or SA or AV node conduction (see [[Diltiazem hydrochloride injection warnings|WARNINGS]]).
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| As with all drugs, care should be exercised when treating patients with multiple medications. Diltiazem hydrochloride undergoes extensive metabolism by the [[cytochrome P-450 ]]mixed function oxidase system. Although specific pharmacokinetic drug-drug interaction studies have not been conducted with single intravenous injection or constant rate intravenous infusion, coadministration of diltiazem hydrochloride injection with other agents which primarily undergo the same route of biotransformation may result in competitive inhibition of metabolism.
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| ===Digitalis. ===
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| Intravenous diltiazem has been administered to patients receiving either intravenous or oral [[digitalis ]]therapy. The combination of the two drugs was well tolerated without serious adverse effects. However, since both drugs affect AV nodal conduction, patients should be monitored for excessive slowing of the heart rate and/or AV block.
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| ===Beta-blockers. ===
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| Intravenous diltiazem has been administered to patients on chronic oral [[beta-blocker ]]therapy. The combination of the two drugs was generally well tolerated without serious adverse effects. If intravenous diltiazem is administered to patients receiving chronic oral [[beta-blocker]] therapy, the possibility for [[bradycardia]], [[AV block]], and/or depression of contractility should be considered (see[[Diltiazem hydrochloride injection contraindications| CONTRAINDICATIONS]]). Oral administration of diltiazem with [[propranolol ]]in five normal volunteers resulted in increased [[propranolol ]]levels in all subjects and bioavailability of [[propranolol ]]was increased approximately 50%. In vitro, propranolol appears to be displaced from its binding sites by diltiazem.
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| ===Anesthetics.=== The depression of cardiac contractility, conductivity, and automaticity as well as the vascular dilation associated with [[anesthetics ]]may be potentiated by [[calcium channel blockers]]. When used concomitantly, anesthetics and calcium blockers should be titrated carefully.
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| ===Cyclosporine.===
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| A pharmacokinetic interaction between diltiazem and [[cyclosporine ]]has been observed during studies involving renal and cardiac transplant patients. In renal and [[cardiac transplant]] recipients, a reduction of [[cyclosporine ]]dose ranging from 15% to 48% was necessary to maintain [[cyclosporine ]]trough concentrations similar to those seen prior to the addition of diltiazem. If these agents are to be administered concurrently, cyclosporine concentrations should be monitored, especially when diltiazem therapy is initiated, adjusted or discontinued.
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| The effect of cyclosporine on diltiazem plasma concentrations has not been evaluated.
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| ===Carbamazepine.===
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| Concomitant administration of oral diltiazem with [[carbamazepine ]]has been reported to result in elevated plasma levels of [[carbamazepine ]](by 40 to 72%), resulting in toxicity in some cases. Patients receiving these drugs concurrently should be monitored for a potential drug interaction.<ref name="dailymed.nlm.nih.gov">{{Cite web | last = | first = | title = DILTIAZEM HYDROCHLORIDE INJECTION [AKORN, INC.] | url = http://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=81c5cf23-a6f8-454a-9575-d01edf49ed34 | publisher = | date = | accessdate = 5 March 2014 }}</ref>
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| ==References==
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| {{Reflist|2}}
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| [[Category:Cardiovascular Drugs]]
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| [[Category:Drugs]]
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