The same is true for perscription medications such as Propicia. If you are on HRT, you MUST talk with your doctor before using Propicia and other "internal" medications. There are warnings regarding women taking Propicia. I don't know if it is because it can cause birth defect, or if there is an interaction with estrogen.
You may want to consider a transplant. I am considering it, although it is VERY expensive. There is a place in Tulsa, Oklahoma, that is about half cost. They claim it is because they keep their services simple.
Caviat Emptor - Let the Buyer Beware.
Chaunte