Comprar 99.3% Raw AI Aromatase Inhibitor Drugs Formestane Powder Formestane (LENTARON) Description Formestane (LENTARON) is a type I, steroidal aromatase inhibitor. It is used in the treatment of estrogen-receptor positive breast cancer in post-menopausal women. It is available as an intramuscular depot injection. Formestane is often used to suppress estrogen production from anabolic steroids or prohormones. It also acts as …