Drug interactions
Estradiol + Valproic acid
Severity: Moderate
Estradiol and Valproic acid: 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
Estrogens can increase glucuronidation of valproate, which may lower its serum concentrations. In patients whose epilepsy is well controlled, this could allow breakthrough seizures. The effect is variable and is best documented with ethinylestradiol-containing contraceptives.
What this interaction means in plain words
Estradiol and Valproic acid 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.
Estradiol belongs to Endocrine; Valproic acid belongs to Central Nervous System.
Why it happens
Estrogens may induce UDP-glucuronosyltransferase activity, increasing valproate glucuronide formation and clearance.
What to do
Monitor seizure frequency and valproate concentrations when estrogen therapy is started, stopped or changed. Adjust the valproate dose if control worsens.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Estradiol and Valproic acid, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Valproic acid
- Ertapenem + Valproic acid Contraindicated
- Imipenem / cilastatin / relebactam + Valproic acid Contraindicated
- Imipenem / cilastatin + Valproic acid Contraindicated
- Meropenem / vaborbactam + Valproic acid Contraindicated
- Meropenem + Valproic acid Contraindicated
- Calcium / magnesium / potassium / sodium oxybates + Valproic acid Major
Other interactions of Estradiol
- Anastrozole + Estradiol Contraindicated
- Estradiol + Fezolinetant Contraindicated
- Estradiol + Ospemifene Contraindicated
- Antithrombin alfa + Estradiol Major
- Antithrombin iii + Estradiol Major
- Estradiol + Exemestane Major
Frequently asked questions
Can I take Estradiol with Valproic acid?
MediHelp rates the interaction as moderate. Estradiol and Valproic acid 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. Estrogens can increase glucuronidation of valproate, which may lower its serum concentrations. In patients whose epilepsy is well controlled, this could allow breakthrough seizures. The effect is variable and is best documented with ethinylestradiol-containing contraceptives.
How serious is the interaction between Estradiol and Valproic acid?
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 seizure frequency and valproate concentrations when estrogen therapy is started, stopped or changed. Adjust the valproate dose if control worsens.
What other medicines interact with Valproic acid?
MediHelp also lists interactions of Valproic acid with, for example, Ertapenem, Imipenem / cilastatin / relebactam, Imipenem / cilastatin. The full list is on the Valproic acid page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
