I'm so sorry to hear about your dad. Alzheimer's is such a hard disease to deal with for both the suffer and the family. Aricept is a great drug to slow Alzheimer's down. By husband's grandmother is taking Aricept now. Before she was taking the drug she couldn't remember her childrens names or even her husbands at times. Since she's been on the drug now she's able to remember names and the days most of the time. I hope the drug works as well for your father as it did for grandmomma.