Amlodipine
"After being hospitalized for very high BP that my other medications weren't able to control -- I was prescribed .5 of Norvasc. Within 3 hours, my BP was down to 70/ 52, and continued to drop to 68/ 42 with my pulse going as low as 40 bpm. 

I came very close to calling 911, but after a couple of hours of drinking water -- I was able to get the BP up to around 90/65. Obviously I will not take this medicine again -- and feel that the side effect for it wasn't given"