Progesterone is a medication that is used to prevent changes in the uterus in postmenopausal women who are taking conjugated estrogens. It is also used to regulate the menstrual cycle and treat amenorrhea in women who are still menstruating. However, this medication is available only with a prescription from a doctor.

Progesterone is available in two forms:

1. Capsule
2. Liquid-filled capsule