A hormone used to stimulate the development of multiple follicles. Injectable human menopausal gonadotropin, also known as menotropin (brand names: Humegon, Pergonal, Repronex), is a purified preparation of the naturally occurring hormones follicle-stimulating hormone (FSH) and luteinizing hormone (LH). These medications stimulate the ovaries to develop many follicles and mature eggs. If your pituitary does not release FSH and LH properly, hMG can be given to stimulate the production of eggs. Studies show that about 90% of women on hMG will ovulate and 40% will conceive when the tubes are patent, the sperm count is adequate, and the ovary has normal reserve. Formulations of hMG intended for intramuscular injection (an injection into muscle) must not be administered subcutaneously (into fat), and vice versa. If you are administering this medication at home, your doctor will give you detailed instructions on how to mix the solution and give yourself the injection. Do not inject menotropins if you are not sure how. Side effects may include: allergic reactions, ovarian enlargement and discomfort, hyperstimulation syndrome, multiple gestation, abdominal pain, and headaches. Discomfort and bruising may occur at the injection site. Monitoring with ultrasounds and blood tests minimizes the risk of complications.