Abortion pill, a drug specifically designed to cause abortion, see:

Mifepristone is a synthetic steroid compound used as a pharmaceutical. It is used as an abortifacient in the first two months of pregnancy, and in smaller doses as an emergency contraceptive. It can also be used as a treatment for obstetric...

Methotrexate (rINN) (pronounced /mɛθəˈtrɛkseɪt/), abbreviated MTX and formerly known as amethopterin, is an antimetabolite and antifolate drug used in treatment of cancer and autoimmune diseases. It acts by inhibiting the metabolism of folic...

Misoprostol is a drug that is FDA-approved in the United States for the prevention of NSAID-induced gastric ulcers. It is also used (and approved in other countries) to induce labor and as an abortifacient. It was invented and marketed by G.D. Searle...

abortifacient

medical abortion

Levonorgestrel (often referred to as an abortion pill, though it is in fact a hormonal contraceptive)