Drug interactions
Bazedoxifene-conjugated estrogens + Rifampin
Severity: Major
Bazedoxifene-conjugated estrogens and Rifampin: major 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
Rifampin induces metabolic enzymes and can lower exposure to both bazedoxifene and the estrogens. Reduced bazedoxifene exposure may weaken endometrial protection, raising the risk of endometrial hyperplasia, and estrogen efficacy may also fall.
What this interaction means in plain words
Bazedoxifene-conjugated estrogens and Rifampin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Induction of CYP3A4 and UGT enzymes by rifampin increases clearance of bazedoxifene and estrogens.
What to do
Avoid the combination and use an alternative therapy if rifampin is required. If it cannot be avoided, monitor for breakthrough bleeding and loss of symptom control.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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
Frequently asked questions
Can I take Bazedoxifene-conjugated estrogens with Rifampin?
MediHelp rates the interaction as major. Bazedoxifene-conjugated estrogens and Rifampin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Rifampin induces metabolic enzymes and can lower exposure to both bazedoxifene and the estrogens. Reduced bazedoxifene exposure may weaken endometrial protection, raising the risk of endometrial hyperplasia, and estrogen efficacy may also fall.
How serious is the interaction between Bazedoxifene-conjugated estrogens and Rifampin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and use an alternative therapy if rifampin is required. If it cannot be avoided, monitor for breakthrough bleeding and loss of symptom control.
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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