Drug interactions
Ethinylestradiol + Topiramate
Severity: Moderate
Ethinylestradiol and Topiramate: 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
Topiramate can lower ethinylestradiol exposure, especially at higher topiramate doses, which may reduce contraceptive effectiveness. Patients may also notice breakthrough bleeding or irregular menses.
What this interaction means in plain words
Ethinylestradiol and Topiramate 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.
Why it happens
Dose-dependent induction of hepatic metabolism by topiramate lowers ethinylestradiol exposure.
What to do
Advise an additional or alternative non-hormonal contraceptive method, especially with topiramate doses above 200 mg daily. Report breakthrough bleeding, which may indicate reduced contraceptive efficacy.
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 Topiramate
Frequently asked questions
Can I take Ethinylestradiol with Topiramate?
MediHelp rates the interaction as moderate. Ethinylestradiol and Topiramate 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. Topiramate can lower ethinylestradiol exposure, especially at higher topiramate doses, which may reduce contraceptive effectiveness. Patients may also notice breakthrough bleeding or irregular menses.
How serious is the interaction between Ethinylestradiol and Topiramate?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise an additional or alternative non-hormonal contraceptive method, especially with topiramate doses above 200 mg daily. Report breakthrough bleeding, which may indicate reduced contraceptive efficacy.
What other medicines interact with Topiramate?
MediHelp also lists interactions of Topiramate with, for example, Benzhydrocodone / acetaminophen, Buprenorphine long-acting, Buprenorphine subdermal implant. The full list is on the Topiramate page.
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