High Quality Content by WIKIPEDIA articles! It has been suggested that Medical abortion be merged into this article or section. An abortifacient is a substance that induces abortion. Abortifacients for animals that have mated undesirably are known as mismating shots. Common abortifacients used in performing medical abortions include mifepristone, which is typically used in conjunction with misoprostol in a two-step approach. There are also several herbal mixtures with abortifacient claims, though there is no available data on the efficacy of these plants in humans. When used in oral form may be referred to as an abortion pill.