Primodex 100 is identified with methenolone enanthate, an esterified derivative of methenolone. Methenolone belongs to the anabolic-androgenic steroid family and has a history of pharmaceutical use.

The enanthate ester affects the release characteristics of methenolone and distinguishes this preparation from methenolone acetate. The stated 100 strength describes the supplied formulation.

Anabolic-androgenic steroid exposure may suppress endogenous hormone production and affect fertility, lipid metabolism, cardiovascular health, and androgen-sensitive tissues. Historical pharmaceutical use should not be confused with unrestricted non-medical use.