Amendments to FSRH Guidance Documents: Drug Interactions and Emergency Contraception Drug Interactions (2011): Page 9 of the original version of this CEU Guidance Document (issued in January 2011) incorrectly stated that the interaction between lamotrigine and combined hormonal contraception (CHC) only applies to lamotrigine monotherapy. CHC also reduces lamotrigine levels when lamotrigine is combined with […]