Conjugated estrogens and bazedoxifene and Estradiol and dienogest interaction
Conjugated estrogens and bazedoxifene and Estradiol and dienogest: 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 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 )
Free hormone concentrations, such as testosterone and estradiol, may be decreased.
• Women taking DUAVEE should not take progestins, additional estrogens or additional estrogen agonist/antagonists ( 5.1 )
From the Estradiol and dienogest (Natazia) label · effective 2024-06-26
Effects of Other Drugs on Combined Oral Contraceptives Substances diminishing the efficacy of COCs: Dienogest is a substrate of CYP3A4.
Effects of Combined Oral Contraceptives on Other Drugs COCs containing ethinyl estradiol may inhibit the metabolism of other compounds.
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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.