Exemestane is an antitumor agent, steroidal Aromatase Inhibitor, which shares similarities in structure with the natural steroid hormone androstenedione. Like most Aromatase Inhibitors, Exemestane provides anti-estrogenic protection and helps the body combat variations of cancer and tumours. It does not have progestogenic and estrogenic activity and affects the biosynthesis of cortisol and aldosterone in the adrenal glands. Among steroid users is widely applied during the cycle and PCT.