A young woman on stable carbamazepine therapy for epilepsy r… | MyMerci
Medical EmergenciesPA
Question
A young woman on stable carbamazepine therapy for epilepsy reports a new unplanned pregnancy. Which counseling regarding her contraceptive history is most accurate?
1"Pregnancy is a known cure for epilepsy; you can stop carbamazepine now."
2"Carbamazepine induces CYP3A4, accelerating COC metabolism; non-hormonal or higher-dose contraception is needed during therapy."✓ Correct answer
3"Combined OC effectiveness is unaffected by anticonvulsants."
4"The COC failed because you missed doses; nothing else could have prevented this."
Explanation
Correct (2): Carbamazepine is a potent CYP3A4 inducer and autoinducer — it accelerates metabolism of estrogen-containing contraceptives, reducing efficacy. Women on enzyme-inducing anticonvulsants need higher-estrogen COCs, copper IUD, depot medroxyprogesterone, or barrier methods. (1) Blames the patient incorrectly. (3) Pregnancy does not cure epilepsy. (4) Effectiveness is significantly reduced.