Felbamate is an antiepileptic drug used for the treatment of epilepsy, partial seizures in adults, and partial and generalized seizures associated with Lennox-Gastaut syndrome in children. The drug has a narrow therapeutic range and carries an increased risk of fatal aplastic anemia and/or liver failure. This certified solution standard is suitable as starting material for calibrators or controls for a variety of LC/MS or GC/MS applications such as forensic analysis, clinical toxicology and therapeutic drug monitoring.