Abortifacients are substances that induce abortion by terminating a pregnancy. They can be found in various forms, including medications and herbal remedies. Commonly used abortifacients include mifepristone and misoprostol, which are often prescribed in combination to safely end early pregnancies. These substances work by blocking hormones necessary for maintaining pregnancy or by causing the uterus to contract and expel its contents. The use of abortifacients is subject to legal regulations that vary by country, and they are typically used under medical supervision to ensure safety and effectiveness.