The World Health Organization's ATC classification organizes medical drugs based on therapeutic properties, chemical composition, and anatomy. It helps make essential medicines readily available globally and is widely used in the pharmaceutical industry.
| Level | Code | Title | |
|---|---|---|---|
| 1 | R | Respiratory system | |
| 2 | R03 | Drugs for obstructive airway diseases | |
| 3 | R03D | Other systemic drugs for obstructive airway diseases | |
| 4 | R03DA | Xanthines | |
| 5 | R03DA09 | Acefylline piperazine |
