Final answer:
Mifepristone (RU-486) and ulipristal are medications used for medical abortion and emergency contraception. They work by blocking the effects of progesterone, a hormone necessary for maintaining pregnancy. These medications should only be used under the supervision of a healthcare professional.
Step-by-step explanation:
Mifepristone, also known as RU-486, is a medication used for medical abortion. It is a synthetic steroid that blocks the effects of progesterone, a hormone that is necessary for maintaining pregnancy. Ulipristal is another emergency contraceptive medication that works by blocking progesterone receptors.
Mifepristone and ulipristal are used to prevent or terminate early pregnancy. They are not intended for regular use as a method of birth control. These medications should only be used under the supervision of a healthcare professional. Both mifepristone and ulipristal are considered safe and effective when used according to the prescribed instructions. However, they may have side effects and contraindications, so it is important to discuss with a healthcare provider before using them.