I was already on Cardizem and Enalapril and 2 mos. ago I went on Toprol 25 mg. which I take 1/2 of everyday. Now I am experiencing hearing problems as if I'm in a tunnel during the daytime until the med. wears off some at night. Is anyone else experiencing hearing problems from Toprol? I'm also experiencing shortness of breath, sleeplessness, and severe neck pain. I know 12.50 is a very small dose, but I feel these problems are a direct result of the Toprol.