Mentally I just don't feel alert or explorative. When I read I can only read for about an hour at the most before I have to take a break. Is it because I'm fat? I weight 260 lbs. I take Risperdal for schizophrenia and propranolol.
It could do with your weight to an extent. There are a number of studies showing that at least some physical exercise along with proper diet allows for more nutrients/oxygen to be sent to the brain, raising alertness levels.
I can't say I know how your medications affect your mood/mental status, but exercise pretty much is a cure-a-lot, if not a cure-all. Take your diet into consideration too. Personally, I know I feel sluggish and slow if I eat poorly and don't exercise for a few days.