ELI5: Explain Like I'm 5

Selective progesterone receptor modulator

A selective progesterone receptor modulator is like a special key that can help unlock a door in the body called the progesterone receptor. This key is very selective, meaning it only works on this specific door and not on any other doors in the body.

When the key successfully unlocks the door, it can either turn on or turn off the activity of progesterone, which is a hormone in the body that helps regulate pregnancy and the menstrual cycle.

For example, if the key turns off progesterone activity, it can prevent or delay a pregnancy. If the key turns on progesterone activity, it can help treat conditions like heavy menstrual bleeding or fibroids.

Doctors may use selective progesterone receptor modulators to help treat certain medical conditions or to control fertility, depending on what their patient needs. But because the key is so selective, it can help avoid unwanted side effects that other medications might cause.