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

     N01A ANESTHETICS, GENERAL

       N01AA Ethers

       N01AB Halogenated hydrocarbons

         N01AB01 Halothane

         N01AB02 Chloroform

         N01AB04 Enflurane

         N01AB05 Trichloroethylene

         N01AB06 Isoflurane

         N01AB07 Desflurane

         N01AB08 Sevoflurane

       N01AF Barbiturates, plain

       N01AG Barbiturates in combination with other drugs

       N01AH Opioid anesthetics

       N01AX Other general anesthetics

     N01B ANESTHETICS, LOCAL

   N02 ANALGESICS

   N03 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