Drug interactions
Norethindrone transdermal + Topiramate
Severity: Moderate
Norethindrone transdermal 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 may lower sex hormone exposure at higher doses, potentially reducing the reliability of a transdermal contraceptive containing norethindrone. Irregular bleeding may occur, and unintended pregnancy matters given topiramate's teratogenic risk.
What this interaction means in plain words
Norethindrone transdermal 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
Topiramate may weakly induce hepatic metabolism of contraceptive steroids in a dose-related manner.
What to do
Consider an additional barrier method or a non-hormonal highly effective method such as a copper or levonorgestrel IUD. Monitor for breakthrough bleeding.
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 Norethindrone transdermal with Topiramate?
MediHelp rates the interaction as moderate. Norethindrone transdermal 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 may lower sex hormone exposure at higher doses, potentially reducing the reliability of a transdermal contraceptive containing norethindrone. Irregular bleeding may occur, and unintended pregnancy matters given topiramate's teratogenic risk.
How serious is the interaction between Norethindrone transdermal 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: Consider an additional barrier method or a non-hormonal highly effective method such as a copper or levonorgestrel IUD. Monitor for breakthrough bleeding.
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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