Diltiazem and Lovastatin interaction
Diltiazem and Lovastatin: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Diltiazem (DILTIAZEM HYDROCHLORIDE in SODIUM CHLORIDE) label · effective 2025-04-15
• Statins: Avoid statins metabolized by CYP3A4.
Statins Increased risk of myopathy and rhabdomyolysis with statins metabolized by CYP3A4.
When possible, use a non-CYP3A4-metabolized statin with diltiazem.
From the Lovastatin label · effective 2026-04-03
Concomitant administration with strong CYP3A4 inhibitors (e.g., itraconazole, ketoconazole, posaconazole, voriconazole, HIV protease inhibitors, boceprevir, telaprevir, erythromycin, clarithromycin, telithromycin, nefazodone and cobicistat-containing products) (see WARNINGS , Myopathy/Rhabdomyolysis ).
If short-term treatment with strong CYP3A4 inhibitors is unavoidable, therapy with lovastatin should be suspended during the course of treatment (see CONTRAINDICATIONS ; PRECAUTIONS , Drug Interactions ).
Table VII: Drug Interactions Associated With Increased Risk of Myopathy/Rhabdomyolysis Interacting Agents Prescribing Recommendations Strong CYP3A4 inhibitors, e.g.: Contraindicated with lovastatin Ketoconazole Itraconazole Posaconazole Voriconazole Erythromycin Clarithromycin Telithromycin HIV protease inhibitors Boceprevir Telaprevir Nefazodone Cobicistat-containing…
Danazol, diltiazem, dronedarone, or verapamil with higher doses of lovastatin: The dose of lovastatin should not exceed 20 mg daily in patients receiving concomitant medication with danazol, diltiazem, dronedarone, or verapamil.
The benefits of the use of lovastatin in patients receiving danazol, diltiazem, dronedarone, or verapamil should be carefully weighed against the risks of these combinations.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.