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 | H | Systemic hormonal preparations, excl. Sex hormones and insulins | |
| 2 | H03 | Thyroid therapy | |
| 3 | H03A | Thyroid preparations | |
| 4 | H03AA | Thyroid hormones | |
| 5 | H03AA03 | Combinations of levothyroxine and liothyronine |
Note the following: The list of brand names is continuously updated, and thus does not include the total of products circulating worldwide.
