My father, who has Alzheimer's pretty bad, came home after appx. 2 days at a mental health facility for assessment. In his meds., there was a pill I cannot id. It's a sm.round white pill. SIDE 1 just has a line down the center where it can be split in half. SIDE 2 has ONLY the following imprinted; CYP. A very simple looking thing but I CANNOT find any info on this pill! Please help if you can.