1  Agents affecting nervous system and sensory organs

 2  Agents affecting individual organs

   21  Cardiovascular agents

   22  Respiratory organ agents

   23  Digestive organ agents

     231  Antidiarrheals, intestinal regulators

     232  Peptic ulcer agents

       2321  Methylmethionines

       2322  Glutamines

       2323  Azulenes

       2324  Herbal medicines

       2325  H2 blockers

       2329  Others

     233  Stomachics and digestives

     234  Antacids

     235  Purgatives, clysters

     236  Cholagogues

     237  Gastrointestinal agents and combinations

     239  Miscellaneous

   24  Hormones

   25  Urogenital and anal organ agents

   26  Epidermides

   27  Dental preparations

   29  Other agents affecting individual organs

 3  Agents affecting metabolism

 4  Agents affecting cellular function

 5  Crude drugs and Chinese medicine formulations

 6  Agents against pathologic organisms and parasites

 7  Agents not mainly for therapeutic purpose

 8  Narcotics