Drug interactions
Bazedoxifene-conjugated estrogens + Rifabutin
Severity: Moderate
Bazedoxifene-conjugated estrogens and Rifabutin: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Rifabutin induces CYP3A4, although less strongly than rifampin, and may lower exposure to the estrogen and bazedoxifene components. Reduced exposure can lead to loss of symptom relief and diminished endometrial protection.
What this interaction means in plain words
Bazedoxifene-conjugated estrogens and Rifabutin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Bazedoxifene-conjugated estrogens belongs to Endocrine; Rifabutin belongs to Anti Bacterial.
Why it happens
Induction of CYP3A4 and glucuronidation by rifabutin increases clearance of estrogens and bazedoxifene.
What to do
Monitor for recurrent vasomotor symptoms and any abnormal uterine bleeding and evaluate bleeding promptly. Consider an alternative menopausal therapy if efficacy is lost during prolonged rifabutin treatment.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Bazedoxifene-conjugated estrogens
- Anastrozole + Bazedoxifene-conjugated estrogens Contraindicated
- Bazedoxifene-conjugated estrogens + Ospemifene Contraindicated
- Antithrombin alfa + Bazedoxifene-conjugated estrogens Major
- Antithrombin iii + Bazedoxifene-conjugated estrogens Major
- Bazedoxifene-conjugated estrogens + Bemiparin Major
- Bazedoxifene-conjugated estrogens + Carbamazepine Major
Other interactions of Rifabutin
- Cabotegravir + Rifabutin Contraindicated
- Lorlatinib + Rifabutin Contraindicated
- Rifabutin + Voriconazole Contraindicated
- Apixaban + Rifabutin Major
- Axitinib + Rifabutin Major
- Brexpiprazole + Rifabutin Major
Frequently asked questions
Can I take Bazedoxifene-conjugated estrogens with Rifabutin?
MediHelp rates the interaction as moderate. Bazedoxifene-conjugated estrogens and Rifabutin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Rifabutin induces CYP3A4, although less strongly than rifampin, and may lower exposure to the estrogen and bazedoxifene components. Reduced exposure can lead to loss of symptom relief and diminished endometrial protection.
How serious is the interaction between Bazedoxifene-conjugated estrogens and Rifabutin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for recurrent vasomotor symptoms and any abnormal uterine bleeding and evaluate bleeding promptly. Consider an alternative menopausal therapy if efficacy is lost during prolonged rifabutin treatment.
What other medicines interact with Bazedoxifene-conjugated estrogens?
MediHelp also lists interactions of Bazedoxifene-conjugated estrogens with, for example, Anastrozole, Ospemifene, Antithrombin alfa. The full list is on the Bazedoxifene-conjugated estrogens page.
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