Drug interactions
Bazedoxifene-conjugated estrogens + Carbamazepine
Severity: Major
Bazedoxifene-conjugated estrogens and Carbamazepine: 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
Carbamazepine is a strong inducer of CYP3A4 and can lower exposure to the estrogen and bazedoxifene components. Reduced exposure may cause loss of menopausal symptom control and, more importantly, weaker endometrial protection from bazedoxifene.
What this interaction means in plain words
Bazedoxifene-conjugated estrogens and Carbamazepine 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.
Bazedoxifene-conjugated estrogens belongs to Endocrine; Carbamazepine belongs to Central Nervous System.
Why it happens
Induction of CYP3A4 and other metabolic pathways by carbamazepine increases clearance of estrogens and bazedoxifene.
What to do
Prefer a non-inducing anticonvulsant if possible. If the combination is needed, monitor for breakthrough symptoms and abnormal uterine bleeding and investigate any bleeding promptly.
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 + Dalteparin Major
Other interactions of Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Bazedoxifene-conjugated estrogens with Carbamazepine?
MediHelp rates the interaction as major. Bazedoxifene-conjugated estrogens and Carbamazepine 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. Carbamazepine is a strong inducer of CYP3A4 and can lower exposure to the estrogen and bazedoxifene components. Reduced exposure may cause loss of menopausal symptom control and, more importantly, weaker endometrial protection from bazedoxifene.
How serious is the interaction between Bazedoxifene-conjugated estrogens and Carbamazepine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer a non-inducing anticonvulsant if possible. If the combination is needed, monitor for breakthrough symptoms and abnormal uterine bleeding and investigate any bleeding promptly.
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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