Atazanavir and Nisoldipine interaction
Atazanavir and Nisoldipine: 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 Nisoldipine (Sular) label · effective 2026-03-12
CYP3A4 inhibitors and inducers : SULAR is substrate of CYP3A4 and coadministration of SULAR with any known inducer or inhibitor of CYP3A4 should be avoided in general.
From the Atazanavir (REYATAZ) label · effective 2024-12-05
Calcium channel blockers: diltiazem ↑ diltiazem and desacetyl-diltiazem Caution is warranted.
Coadministration of diltiazem and REYATAZ with ritonavir has not been studied. felodipine, nifedipine, nicardipine, and verapamil ↑ calcium channel blocker Caution is warranted.
Dose titration of the calcium channel blocker should be considered.
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.