http://www.medications.com/effect/view/30609 I started taking the generic of Toprol (metaprolol) 3 months ago. I'm on 150mg per day for a rapid heartbeat, I'm 39 years old. It has helped my heart problems but I don't know if the side effects are worth it. I experience major fatigue that may last a w Mon, 19 May 2008 15:46:31 -0400 http://www.medications.com/effect/view/30609?item=8425 Are you suffering from hyerthyroid? Everything you are describing is hyperthyroid, including the going to the bathroom thing. I am a recovering Graves' Disease patient, and I felt somehow compelled to reply to your post, in view of the fact that Graves http://www.medications.com/effect/view/30609?item=8425