How does the abortion pill work?

The abortion pill requires a pregnant person to take two different medications in the following order:
Mifepristone stops the pregnancy from growing. It blocks the body from producing the progesterone hormone, which is necessary for a pregnancy to continue. Without progesterone, the pregnancy will end.
Misoprostol, taken immediately or later, induces cramping and bleeding to cause the uterus to empty.
In cases when mifepristone may not be available, taking a misoprostol-only regimen may still be effective.