cluster headaches
"My neurologist put me on just about every preventative medicine on the market and none helped stop my clusters.  A high dose of Verapamil ER finally did the trick. (240 mg 3x a day)  After almost 25 years of episodic cluster headaches I have finally been virtually headache free for about 3 years now! I am a bit worried about the side effects of taking such a high dose for such an extended time though.  I've recently been having some voice issues and I'm wondering if there is a correlation."