Does Carbamazepine Interact With Diltiazem?

Carbamazepine : Concomitant administration of diltiazem with carbamazepine has been reported to result in elevated serum levels of carbamazepine (40% to 72% increase), resulting in toxicity in some cases.

Severity: Minor

Severity basis: drug interactions section. Combining Carbamazepine (Anticonvulsant) and Diltiazem (Calcium channel blocker) is classified as a minor interaction.

What to Do

This is generally a minor interaction, but review it with your pharmacist to be sure it is safe for you.

From the FDA Label

Carbamazepine : Concomitant administration of diltiazem with carbamazepine has been reported to result in elevated serum levels of carbamazepine (40% to 72% increase), resulting in toxicity in some cases.

Source: FDA structured product labeling (set_id 0089fc7a-a7aa-4873-b699-39a1b21616ca).

Carbamazepine

Anticonvulsant

Brands: Tegretol, Carbatrol

View Carbamazepine safety profile

Diltiazem

Calcium channel blocker

Brands: Cardizem, Cartia XT, Tiazac

View Diltiazem safety profile

Check these against your full medication list in our free Interaction Checker

This information is educational — not medical advice.

This page is provided for general educational purposes and summarizes publicly available data from sources such as the U.S. Food & Drug Administration. It is not a substitute for the judgment of a licensed clinician and should not be used to start, stop, or change any medication. It may be incomplete or out of date, and individual circumstances vary. Always talk with your prescriber or pharmacist about your specific medications and health conditions. If you think you may have a medical emergency, call 911.

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