alopecia
"Please be careful.  I used the 4% for 2 months and my blood pressure went up toe 258!. It worked on my hair, but I was dizzy and had headaches.  When I figured out what was going on, I washed my hair and stopped using it.  I could not find the blood pressure warning in the current literature but found it in a 2003 medical blog.  Rogaine has not been tested on people over 65, and in rare cases it can raise your blood pressure.  In 4 days since stopping, my pressure is going down and currently is in the 150's.  The 2003 blog said it would take between 1-2 months to be completely out of your system.  I would recommend anyone with high blood pressure, to stay away from it."