Amlodipine
"I have been taking Norvasc for probably 30 years.  The first 20, the drug worked to lower my blood pressure well.  In the last ten years, I've been plagued with scorching legs.  It has literally ruined my life.  Doctors never even had a clue and I never thought it was Norvasc that was hurting me until I had trouble a week ago getting the prescription filled I was out of for 4 days.  On the 4th day without taking it, my legs were feeling pretty good.  I got my prescription refilled took the pill and the next day, I was back to debilitating pain.  I haven't taken it since.  I am now feeling pressure in my head as I've always been prone to migraine headaches.  I never got one after I started taking Norvasc.  I think I'll take the migraines."