Carbamazepine and Etinylestradiol: Drug Interaction Guide

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

Interaction severity: Major — avoid combination

How Carbamazepine interacts with Etinylestradiol

Carbamazepine induces CYP3A4 and UGT enzymes, increasing metabolism of ethinylestradiol and progestogens with risk of contraceptive failure.

What you should do

Use a non-hormonal contraceptive (copper IUD) or depot medroxyprogesterone; combined oral contraceptives are not reliable with enzyme-inducing antiepileptics.

Key facts

Severity

Major — avoid combination

Mechanism

Carbamazepine induces CYP3A4 and UGT enzymes, increasing metabolism of ethinylestradiol and progestogens with risk of co...

Action

Use a non-hormonal contraceptive (copper IUD) or depot medroxyprogesterone; combined oral contraceptives are not reliabl...

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 Etinylestradiol together?

No — this combination should generally be avoided. Use a non-hormonal contraceptive (copper IUD) or depot medroxyprogesterone; combined oral contraceptives are not reliable with enzyme-inducing antiepileptics.

What is the severity of this interaction?

The interaction between Carbamazepine and Etinylestradiol is classified as Major — avoid combination. Carbamazepine induces CYP3A4 and UGT enzymes, increasing metabolism of ethinylestradiol and progestogens with risk of contraceptive failure.

What should I do if I'm prescribed both?

Use a non-hormonal contraceptive (copper IUD) or depot medroxyprogesterone; combined oral contraceptives are not reliable with enzyme-inducing antiepileptics. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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