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

   N04 ANTI-PARKINSON DRUGS

   N05 PSYCHOLEPTICS

     N05A ANTIPSYCHOTICS

     N05B ANXIOLYTICS

     N05C HYPNOTICS AND SEDATIVES

       N05CA Barbiturates, plain

       N05CB Barbiturates, combinations

       N05CC Aldehydes and derivatives

         N05CC01 Chloral hydrate

         N05CC02 Chloralodol

         N05CC03 Acetylglycinamide chloral hydrate

         N05CC04 Dichloralphenazone

         N05CC05 Paraldehyde

       N05CD Benzodiazepine derivatives

       N05CE Piperidinedione derivatives

       N05CF Benzodiazepine related drugs

       N05CH Melatonin receptor agonists

       N05CJ Orexin receptor antagonists

       N05CM Other hypnotics and sedatives

       N05CX Hypnotics and sedatives in combination, excl. barbiturates

   N06 PSYCHOANALEPTICS

   N07 OTHER NERVOUS SYSTEM DRUGS

 P ANTIPARASITIC PRODUCTS, INSECTICIDES AND REPELLENTS

 R RESPIRATORY SYSTEM

 S SENSORY ORGANS

 V VARIOUS