A woman with an etonogestrel implant in situ is started on phenytoin for newly diagnosed epilepsy. What is the most appropriate contraceptive advice?...

Question

A woman with an etonogestrel implant in situ is started on phenytoin for newly diagnosed epilepsy. What is the most appropriate contraceptive advice?

Accepted Answer

Remove the implant and switch to a method unaffected by enzyme inducers

Answer

The implant remains fully effective with phenytoin

Answer

Add condoms while taking phenytoin and for 28 days after stopping

Answer

Increase the frequency of implant replacement to every 2 years

Answer

No additional precautions are needed as phenytoin is not an enzyme inducer

uk-dfsrh MCQ (SBA): Implant and Enzyme-Inducing Drug Interaction