Atazanavir and Darunavir interaction
Atazanavir and Darunavir: 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 Atazanavir (REYATAZ) label · effective 2024-12-05
Others ↑ other protease inhibitor Coadministration with other protease inhibitors is not recommended.
Resistance to atazanavir may not preclude the subsequent use of other protease inhibitors [see Microbiology (12.4) ] .
Potential for REYATAZ to Affect Other Drugs Atazanavir is an inhibitor of CYP3A and UGT1A1.
From the Darunavir (PREZISTA) label · effective 2025-08-29
Co-administration of darunavir and ritonavir and other drugs that inhibit CYP3A, or P-gp may decrease the clearance of darunavir and ritonavir and may result in increased plasma concentrations of darunavir and ritonavir (see Table 10 ).
Other HIV protease inhibitors, except atazanavir [see Drug Interactions (7.4) ] As co-administration with PREZISTA/ritonavir has not been studied, co-administration is not recommended.
Drugs without Clinically Significant Interactions with PREZISTA No dosage adjustments are recommended when PREZISTA/ritonavir is co-administered with the following medications: atazanavir, dolutegravir, efavirenz, etravirine, nevirapine, nucleoside reverse transcriptase inhibitors (abacavir, emtricitabine, emtricitabine/tenofovir alafenamide, lamivudine, stavudine,…
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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.