Has anyone had a terrible allergic reacton to propecia. I have been on it for about 18 months and just stopped 3 weeks ago. I noticed I started getting hives all over my body. Also, on November 14th of this year I had to be rushed to the ER for Atrial Fibrilation. I am a 28 year-old, healthy male who works out every day. The hives are on my arms, sides of my torso, and back. I am very concerned and have started taking anti-histamines. [/b]