Medroxyprogesterone Prefilled Syringe injection is a long-acting form of the hormone progesterone used primarily for birth control and to treat certain menstrual and gynecological conditions. It works by preventing ovulation, thickening cervical mucus to block sperm, and altering the uterine lining to prevent implantation. Administered as an intramuscular injection, it provides contraceptive protection for up to three months and is also used to manage endometriosis and abnormal uterine bleeding.