atc code n03 atc code n03 atc code n03 antiepileptics is a therapeutic subgroup of the anatomical therapeutic chemical classification system, a system of alphanumeric codes developed by the world health organization (who) for the classification of drugs and other medical products. subgroup n03 is part of the anatomical group n nervous system. atc codes n nervous system n01 anesthetics n02 analgesics n03 antiepileptics n04 anti-parkinson drugs n05 psycholeptics n06 psychoanaleptics n07 other nervous system drugs atcvet only qn51 products for animal euthanasia a b c d g h qi j l m n p r s v codes for veterinary use (atcvet codes) can be created by placing the letter q in front of the human atc code: for example, qn03. national issues of the atc classification may include additional codes not present in this list, which follows the who version. n03a antiepileptics n03aa barbiturates and derivatives n03aa01 methylphenobarbital n03aa02 phenobarbital n03aa03 primidone n03aa04 barbexaclone n03aa30 metharbital n03ab hydantoin derivatives n03ab01 ethotoin n03ab02 phenytoin n03ab03 amino(diphenylhydantoin) valeric acid (neocitrullamon) n03ab04 mephenytoin n03ab05 fosphenytoin n03ab52 phenytoin, combinations n03ab54 mephenytoin, combinations n03ac oxazolidine derivatives n03ac01 paramethadione n03ac02 trimethadione n03ac03 ethadione n03ad succinimide derivatives n03ad01 ethosuximide n03ad02 phensuximide n03ad03 mesuximide n03ad51 ethosuximide, combinations n03ae benzodiazepine derivatives n03ae01 clonazepam n03af carboxamide derivatives n03af01 carbamazepine n03af02 oxcarbazepine n03af03 rufinamide n03af04 eslicarbazepine n03ag fatty acid derivatives n03ag01 valproic acid n03ag02 valpromide n03ag03 aminobutyric acid n03ag04 vigabatrin n03ag05 progabide n03ag06 tiagabine n03ax other antiepileptics n03ax03 sultiame n03ax07 phenacemide n03ax09 lamotrigine n03ax10 felbamate n03ax11 topiramate n03ax13 pheneturide n03ax14 levetiracetam n03ax15 zonisamide n03ax17 stiripentol n03ax18 lacosamide n03ax19 carisbamate n03ax21 retigabine n03ax22 perampanel n03ax23 brivaracetam n03ax24 cannabidiol n03ax25 cenobamate n03ax26 fenfluramine n03ax27 ganaxolone n03ax30 beclamide qn03ax90 imepitoin qn03ax91 potassium bromide