I think they're confused. If you read the full prescribing information, it's the PILL that screws with the lamotrigine, not the other way around. It's not like a lot of other anticonvulsants. From http://epilepsy.med.nyu.edu/treatment/medications/lamotrigine "Lamotrigine has no effect on other seizure medicines. And unlike some other seizure medicines, it does not reduce the effectiveness of birth control pills.