i was proscribed toprol 25 mg once a day. had sever side effects after taking 2nd dose. got up at about 5;30am to piss and almost fell down from dizyness if i haddent been in my rv where the walls are close i would have fallen. after pissing and returning to bead my heart was racing like when I finnished the stress test. could not go back to sleep so I showered and walked around the event i was at for over an hour, had my breakfast and opened my display for the day, by about 9;30am I was feeling very disy just sitting. called and talked to the oncall card who said if it got worse to call 911 and go to ER. Took a charcol capsul to exorb the poisen which helped some. the next day driving home the 100+ miles I had to stop and rest as I was still feeling a tightness in my chest. after 20 min I was well enough to continue home where i took 2 more charcole calsules. it took several days for my body to flush out this posen.