Itraconazole and Telmisartan and amlodipine interaction
Itraconazole and Telmisartan and amlodipine: 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 Itraconazole (Tolsura) label · effective 2025-04-23
Calcium Channel Blockers Felodipine Nisoldipine Contraindicated during and 2 weeks after TOLSURA treatment.
Calcium channel blockers can have negative inotropic effects which may be additive to those of itraconazole.
Therefore, when co-administering itraconazole and calcium channel blockers, monitor carefully for signs and symptoms of CHF during treatment due to an increased risk of CHF.
Diltiazem Other dihydropyridines Verapamil Monitor for adverse reactions.
Calcium Channel Blockers Diltiazem Monitor for adverse reactions.
From the Telmisartan and amlodipine label · effective 2023-01-30
CYP3A4 Inhibitors Co-administration of a 180 mg daily dose of diltiazem with 5 mg amlodipine in elderly hypertensive patients resulted in a 60% increase in amlodipine systemic exposure.
However, strong inhibitors of CYP3A4 (e.g., ketoconazole, itraconazole, ritonavir) may increase the plasma concentrations of amlodipine to a greater extent.
Monitor for symptoms of hypotension and edema when amlodipine is co-administered with CYP3A4 inhibitors.
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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.