Aricept
"In 2000, my mother suffered persistent diarrhea with this medicine, could not get rid of it until the medicine was stopped. My mother-in-law had the same problem this year.  She also had delusions and paranoia, which have been almost eliminated by a medicine she started a month ago, Risperdone.  If you try Risperdone, start with lowest dose, it makes her very sleepy and a side effect is depressed heart rate, can be dangerous. It also stimulates appetite, which was good for Mom, she was losing 1-2 pounds per week but the doctor cautioned against excess weight gain and concerns regarding diabetes.  We're going to try 100 mg niacin, I've read that it can help cognitive function.  Even when they don't know your name, they know when they are loved.  Show them."