What are the risks for women who use Rogaine?

The single biggest risk is the appearance of hair elsewhere on the body, like facial hair. If the Rogaine (Minoxidil) gets absorbed by the body, it can stimulate vellus hairs to turn into more visible hair in the areas of the mustache, beard area, etc..  A female relative of mine who was given minoxidil for hair loss developed a mustache and a beard and she was very upset over this complication. Of course, when she stopped the medication, the facial hair went away.