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Drug Safety-related Labeling Changes (SrLC)

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CARDIZEM CD (NDA-020062)

(DILTIAZEM HYDROCHLORIDE)

Safety-related Labeling Changes Approved by FDA Center for Drug Evaluation and Research (CDER)

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04/16/2025 (SUPPL-48)

Approved Drug Label (PDF)

7 Drug Interactions

Additions and/or revisions underlined:

Diltiazem is both a substrate and an inhibitor of the Pg-p and cytochrome P450 3A4 enzyme system which may affect exposure to diltiazem and concomitant drugs metabolized by those pathways. Patients with renal and/or hepatic impairment may be particularly at risk of exposure changes.

11/18/2016 (SUPPL-43)

Approved Drug Label (PDF)

7 Drug Interactions

(Addition underlined)

Ivabradine: Concurrent use of diltiazem increases exposure to ivabradine and may exacerbate bradycardia and conduction disturbances. Avoid concomitant use of ivabradine and diltiazem.