Table 2 Classification of prohibited substances coded according to the WADA prohibited list (updated version as of 01 January 2021)

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