Misoprostol
Misoprostol is a synthetic prostaglandin medication used to prevent and treat stomach and duodenal ulcers, induce labor, cause an abortion, and treat postpartum bleeding due to poor contraction of the uterus. It is taken by mouth when used to prevent gastric ulcers in people taking nonsteroidal anti-inflammatory drugs (NSAID). For abortions it is typically used in conjunction with mifepristone or methotrexate, but can be used alone. By itself, effectiveness for abortion is between 82% and 100%. Its efficacy with mifepristone is higher, but varies based on gestational age. The misoprostol-only abortion regimen is typically recommended only when mifepristone is not available. For labor induction or abortion, it is taken by mouth, dissolved in the mouth, or placed in the vagina. For postpartum bleeding it may also be used rectally.