ATC code H03
| ATC code H: Systemic hormonal preparations, excluding sex hormones and insulins | 
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| Other ATC codes | 
ATC code H03 Thyroid therapy is a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System, a system of alphanumeric codes developed by the World Health Organization (WHO) for the classification of drugs and other medical products. Subgroup H03 is part of the anatomical group H Systemic hormonal preparations, excluding sex hormones and insulins.
Codes for veterinary use (ATCvet codes) can be created by placing the letter Q in front of the human ATC code: for example, QH03. 
National issues of the ATC classification may include additional codes not present in this list, which follows the WHO version.