Sy husband started on Toprol 2 months ago. He is 72 & has had high BP for many years. When the cardiologist thought that he may be having heart problems he immediately changed him from Micardis, which was working fine, to Toprol 25mg. At first it seemed to help his high BP remain more stable, but now he is having other problems. His heart rate is usually in the 50's, he's very tired all the time now & has much more trouble remembering things than before. He's also begun having very vivid nightmares. Three days ago he started having diarrhea too. Also for the first time in 30 years we were unable to make love. He also loved working in the yard in the summer but now the heat is just too much for him. He directly attributes these effects to the toprol since that's the only new medication he has been prescribed in the last year. After reading other posts on this site he has decided to wean himself off of it & go back to his previous BP medication. Thanks to all of you who have posted because now he feels more secure in his idea that these problems are from the Toprol.