brain fog is a good way to expalin what toprol xl will do for ya. i know my body and have noticed a difference since i've been taking toprol. well and i'm currently taking 100mg of toproxl and have been a a year. just recently i've decided to tak my med a night to see waht type of difference that would make. now i know its obvious its the medicine that has me drowsy, brain fog, hard to concentrate, lack of energy, light headness, feelings of black out and a "I dont care" type feeling too for an example, just to bring some laughter to this...in most cases if someone tick me off..its like "whatever, it doesnt matter!" and I know that's not the typical me (smile). So I to wonder just as the others, what kind of medicine iis this !! So I'm doing to my doctor and I'M GOING TO GIVE THIS SITUATION TO GOD AND TRUST HIM TO GET ME OFF THIS HORRIBLE MEDICINE" anyone ants to discuss this futher..please feel free to email me ******