Conjugated estrogens and bazedoxifene and Norelgestromin and ethinyl estradiol interaction
Conjugated estrogens and bazedoxifene and Norelgestromin and ethinyl estradiol: 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 Norelgestromin and ethinyl estradiol label · effective 2026-04-16
Breast cancer or other estrogen- or progestin-sensitive cancer ( 4 )
Effects of Other Drugs on Combined Hormonal Contraceptives Substances Decreasing the Plasma Concentrations of CHCs and Potentially Diminishing the Efficacy of CHCs Drugs or herbal products that induce certain enzymes, including cytochrome P450 3A4 (CYP3A4), may decrease the plasma concentrations of CHCs and potentially diminish the effectiveness of CHCs or increase…
From the Conjugated estrogens and bazedoxifene (Duavee) label · effective 2026-07-31
WARNING: ENDOMETRIAL CANCER, CARDIOVASCULAR DISORDERS, AND PROBABLE DEMENTIA • Women taking DUAVEE should not take additional estrogens [see Warnings and Precautions (5.1) ] • There is an increased risk of endometrial cancer in a woman with a uterus who uses unopposed estrogens.
Therefore, the relevance of the WHI findings regarding adverse cardiovascular events and dementia to lower CE doses, other routes of administration, or other estrogen-alone products is not known.
• Women taking DUAVEE should not take additional estrogens ( 5.1 )
• Women taking DUAVEE should not take progestins, additional estrogens or additional estrogen agonist/antagonists ( 5.1 )
Women taking DUAVEE should not take additional estrogens as this may increase the risk of endometrial hyperplasia.
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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.