Megestrol acetate (MGA), sold under the brand name Megace among others, is a progestin medication which is used mainly as an appetite stimulant to treat wasting syndromes such as cachexia. It is also used to treat breast cancer and endometrial cancer, and has been used in birth control. Megestrol acetate is generally formulated alone, although it has been combined with estrogens in birth control formulations. It is usually taken by mouth.