Antiseizure medication selection and retention for adult onset focal epilepsy in a Swedish health service region: A population-based cohort study.

Objective: Historically, approximately half of those with newly diagnosed epilepsy have responded to and tolerated the first antiseizure medication (ASM), but there are few contemporary real-world data. Third-generation ASMs have improved tolerability and are increasingly used according to prescription data. We aimed to describe current ASM selection and retention in adult onset focal epilepsy in western Sweden.