| Sub Class | Description |
|---|---|
| C01A | Based on Medicinal Plants (Mooligai) |
| C01B | Based on Animals and their products (Seeva porul |
| C01C | Based on Metals/nonmetals/Minerals (Thathu Porul) |
| C01D | Based on Diseases (Noigal) |
| C01E | Based on Actions and Properties |
| C01F | Mode and Time of Administration |
| C01G | Characterized by Physical Form |