T.J., I'm mtf so I don't know about Rogaine and ftm.  However, I appreciate your post because I bought Rogaine, got scared thinking because of my spiro and hormones that it might do me damage and wrote the Rogaine company.  I never received a reply. I'm going to start using it now though.  Luckily, I have plenty of hair so I want to keep what I have and regrow any I've lost.