Table 2.

Classification of prohibited substances coded according to the WADA prohibited list (updated version as of 01 January 2021)

WADA Class	Compound Class	Examples of compounds
S1	Anabolic agents	E.g. anabolic androgenic steroids, other anabolic agents such as clenbuterol and selective androgen receptor modulators
S2	Peptide hormones, growth factors, related substances and mimetics	E.g. erythropoietins, chorionic gonadotropin, luteinizing hormone and growth hormone
S3	Beta-2 agonists	E.g. fenoterol, salbutamol and salmeterol
S4	Hormone and metabolic modulators	E.g. aromatase inhibitors (such as anastrozole, letrozole), anti-estrogenic substances (such as tamoxifen, clomiphene), myostatin inhibitors and insulins
S5	Diuretics and masking agents	E.g. desmopressin and acetazolamide