Drug interactions
Bazedoxifene-conjugated estrogens + Fosphenytoin
Severity: Moderate
Bazedoxifene-conjugated estrogens and Fosphenytoin: 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
Phenytoin, the active metabolite, induces CYP3A4 and glucuronidation and may lower exposure to estrogens and bazedoxifene. This can reduce symptom control and weaken endometrial protection.
What this interaction means in plain words
Bazedoxifene-conjugated estrogens and Fosphenytoin 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; Fosphenytoin belongs to Central Nervous System.
Why it happens
Induction of CYP3A4, UGT enzymes and P-glycoprotein increases clearance of the hormone components.
What to do
Monitor for recurrent menopausal symptoms and abnormal uterine bleeding, and evaluate any bleeding. Consider non-hormonal options if efficacy is lost.
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 Fosphenytoin
- Dronedarone + Fosphenytoin Contraindicated
- Fosphenytoin + Ledipasvir-sofosbuvir Contraindicated
- Fosphenytoin + Lorlatinib Contraindicated
- Fosphenytoin + Lurasidone Contraindicated
- Fosphenytoin + Ranolazine Contraindicated
- Fosphenytoin + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Bazedoxifene-conjugated estrogens with Fosphenytoin?
MediHelp rates the interaction as moderate. Bazedoxifene-conjugated estrogens and Fosphenytoin 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. Phenytoin, the active metabolite, induces CYP3A4 and glucuronidation and may lower exposure to estrogens and bazedoxifene. This can reduce symptom control and weaken endometrial protection.
How serious is the interaction between Bazedoxifene-conjugated estrogens and Fosphenytoin?
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 menopausal symptoms and abnormal uterine bleeding, and evaluate any bleeding. Consider non-hormonal options if efficacy is lost.
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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