*Prices reflect U.S. average retail price

Mesuximide (or methsuximide, methosuximide) is a succinimide anticonvulsant medication. It is sold as a racemate by Pfizer under the tradenames Petinutin (Switzerland) and Celontin (United States)... Wikipedia

Manufacturer's Website: Celontin                                                                                                                            Average retail cost: $652/month

Ethosuximide, sold under the brand name Zarontin among others, is a medication used to treat absence seizures. It may be used by itself or with other antiseizure medications such as valproic acid... Wikipedia

Manufacturer's Website: Zarontin                                                                                                                                 Average retail cost: $555/month