Propecia plays with testosterone levels.
A pregnant woman (with a Male child) should not handle a 'broken' capsule because of absorption through the skin. Even a small amount can play havoc on the development of a male fetus (sexual development). Though it is believed it will have little to no effect on a female fetus.
Sooo, don't spaz.
Oh, and it won't help women who suffer from hair loss because their reasons are different than mens.
How do I know? I use it, and studied it before I started. Been using it a year to decent results. Not really regrowing much hair, but I am definitely not losing it either.