A 28-year-old woman is started on phenytoin for epilepsy. She has a 52 mg LNG-IUS in situ. Does she need to change her contraception?...

Question

A 28-year-old woman is started on phenytoin for epilepsy. She has a 52 mg LNG-IUS in situ. Does she need to change her contraception?

Accepted Answer

No, the LNG-IUS acts locally within the uterus and its contraceptive effectiveness is not reduced by enzyme-inducing drugs including phenytoin

Answer

Yes, phenytoin reduces LNG-IUS efficacy

Answer

She needs to have the LNG-IUS replaced more frequently

Answer

She should add condoms to the LNG-IUS

Answer

Phenytoin is not an enzyme inducer

uk-dfsrh MCQ (SBA): LNG-IUS Unaffected by Phenytoin Enzyme Inducer