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Carbamazepine and Ethinylestradiol: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Carbamazepine and Ethinylestradiol unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Carbamazepine interacts with Ethinylestradiol

Carbamazepine is a strong inducer of CYP3A4 and UGT enzymes, accelerating metabolism of ethinylestradiol and reducing contraceptive efficacy with risk of unintended pregnancy.

What you should do

Recommend a non-hormonal contraceptive method (copper IUD or depot medroxyprogesterone) during and for 4 weeks after carbamazepine therapy.

Key facts

Severity

Major — avoid combination

Mechanism

Carbamazepine is a strong inducer of CYP3A4 and UGT enzymes, accelerating metabolism of ethinylestradiol and reducing co...

Action

Recommend a non-hormonal contraceptive method (copper IUD or depot medroxyprogesterone) during and for 4 weeks after car...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Carbamazepine and Ethinylestradiol together?

No — this combination should generally be avoided. Recommend a non-hormonal contraceptive method (copper IUD or depot medroxyprogesterone) during and for 4 weeks after carbamazepine therapy.

What is the severity of this interaction?

The interaction between Carbamazepine and Ethinylestradiol is classified as Major — avoid combination. Carbamazepine is a strong inducer of CYP3A4 and UGT enzymes, accelerating metabolism of ethinylestradiol and reducing contraceptive efficacy with risk of unintended pregnancy.

What should I do if I'm prescribed both?

Recommend a non-hormonal contraceptive method (copper IUD or depot medroxyprogesterone) during and for 4 weeks after carbamazepine therapy. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.