A 31-year-old woman taking phenytoin for epilepsy requires emergency contraception. She had unprotected sexual intercourse 48 hours ago and accepts a ...

Question

A 31-year-old woman taking phenytoin for epilepsy requires emergency contraception. She had unprotected sexual intercourse 48 hours ago and accepts a Cu-IUD. After insertion, she wishes to start the desogestrel POP for ongoing contraception. What advice should she be given about the POP and phenytoin?

Accepted Answer

The POP's efficacy is reduced by phenytoin; she should use a method unaffected by enzyme inducers for long-term contraception

Answer

The POP is unaffected by phenytoin

Answer

She should take a double dose of the POP

Answer

The POP should be taken 4 hours before phenytoin to avoid the interaction

Answer

Phenytoin only interacts with CHC, not with POPs

uk-dfsrh MCQ (SBA): POP Efficacy Reduced by Phenytoin