Darunavir and Estradiol and norethindrone interaction
Darunavir and Estradiol and norethindrone: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Darunavir (PREZISTA) label · effective 2025-08-29
Hormonal contraceptives : Effective alternative (non-hormonal) contraceptive method or a barrier method of contraception is recommended [see Use in Specific Populations (8.3) ] . ethinyl estradiol, norethindrone, drospirenone ↓ ethinyl estradiol ↓ norethindrone drospirenone: effects unknown For co-administration with drospirenone, clinical monitoring is recommended…
No data are available to make recommendations on co-administration with other hormonal contraceptives.
From the Estradiol and norethindrone (Estradiol / Norethindrone Acetate) label · effective 2026-06-26
Inducers and/or inhibitors of CYP3A4 may affect estrogen drug metabolism and decrease or increase the estrogen plasma concentration.
Inhibitors of CYP3A4 such as erythromycin, clarithromycin, ketoconazole, itraconazole, ritonavir and grapefruit juice may increase plasma concentrations of estrogens and result in adverse reactions.
Therefore, inducers or inhibitors of CYP3A4 may affect estrogen drug metabolism.
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.