1  Agents affecting nervous system and sensory organs

 2  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

   61  Antibiotics

   62  Chemotherapeutics

     621  Sulfonamides

       6211  Sulfa drugs with thiazole

       6212  Sulfa drugs with isoxazole

       6213  Sulfa drugs with pyrimidine

       6214  Sulfa drugs with pyridazine

       6215  Sulfa drugs with pyrazole

       6219  Others

     622  Tuberculosis preparations

     623  Leprostatics

     624  Synthetic antibacterials

     625  Antivirals

     629  Miscellaneous

   63  Biological preparations

   64  Parasitics (systemic)

   69  Other agents against pathogenic organisms and parasites

 7  Agents not mainly for therapeutic purpose

 8  Narcotics