Provera Active ingredient: medroxyprogesterone $0.35 for pill Provera improves women's condition when menstrual periods have stopped or in case of an abnormal bleeding of uterus due to hormone imbalance. Prometrium Active ingredient: progesterone $1.79 for pill Progesterone is a type of female hormone (progestin). This medication is similar to the progesterone that your body naturally makes and is given to replace the hormone when your body is not making enough of it.