A ALIMENTARY TRACT AND METABOLISM

 B BLOOD AND BLOOD FORMING ORGANS

 C CARDIOVASCULAR SYSTEM

 D DERMATOLOGICALS

 G GENITO URINARY SYSTEM AND SEX HORMONES

 H SYSTEMIC HORMONAL PREPARATIONS, EXCL. SEX HORMONES AND INSULINS

 J ANTIINFECTIVES FOR SYSTEMIC USE

 L ANTINEOPLASTIC AND IMMUNOMODULATING AGENTS

 M MUSCULO-SKELETAL SYSTEM

 N NERVOUS SYSTEM

   N01 ANESTHETICS

   N02 ANALGESICS

   N03 ANTIEPILEPTICS

     N03A ANTIEPILEPTICS

       N03AA Barbiturates and derivatives

       N03AB Hydantoin derivatives

         N03AB01 Ethotoin

         N03AB02 Phenytoin [DG:DG00846]

         N03AB03 Amino(diphenylhydantoin) valeric acid

         N03AB04 Mephenytoin

         N03AB05 Fosphenytoin [DG:DG00847]

         N03AB52 Phenytoin, combinations

         N03AB54 Mephenytoin, combinations

       N03AC Oxazolidine derivatives

       N03AD Succinimide derivatives

       N03AE Benzodiazepine derivatives

       N03AF Carboxamide derivatives

       N03AG Fatty acid derivatives

       N03AX Other antiepileptics

   N04 ANTI-PARKINSON DRUGS

   N05 PSYCHOLEPTICS

   N06 PSYCHOANALEPTICS

   N07 OTHER NERVOUS SYSTEM DRUGS

 P ANTIPARASITIC PRODUCTS, INSECTICIDES AND REPELLENTS

 R RESPIRATORY SYSTEM

 S SENSORY ORGANS

 V VARIOUS