Megestrol Acetate-d3 is a deuterated compound of Megestrol Acetate. Megestrol Acetate has a CAS number of 595-33-5. Megestrol acetate is a progestogen with actions and uses similar to those of the progestogens in general. Megestrol acetate also has anti-androgenic properties. It is given by mouth in the palliative treatment or as an adjunct to other therapy in endometrial carcinoma and in breast cancer. Megestrol acetate has been approved to treat anorexia and cachexia.