I have been on Toprol for about a month, originally 50mg, steadily increased to 200. I did have the temporary dizziness, sleepiness, and "brainfog" that others have mentioned, but also extreme fluctuations in BP and heartrate. I have awakened in the middle of the night, sweating profusely, my heart beating rapidly, and feeling my pulse in every part of my body. A few hours later, I was so cold, that I couldn't get warm, no matter how much I covered up, and felt too weak to do anything about it. I have also awakened with large bruises that I didn't have the day before, and bleed profusely when scratched or cut. In the past few days, I have developed depression, and didn't know that it was a side-effect, until I got on the internet, and started reading other people's stories.