ATC classification
14 groups · 533 subgroupsThe WHO Anatomical Therapeutic Chemical system organises drugs across five levels — from the broad anatomical main group down to the individual chemical substance. Expand any branch to drill from organ system to mechanism to molecule. Each chemical subgroup links to its class record; each substance links to its drug page.
- L1 Anatomical main group
- L2 Therapeutic subgroup
- L3 Pharmacological subgroup
- L4 Chemical subgroup
- L5 Substance