Incontinence.

My husband has Alzheimer's. He was diagnosed 2 years ago. He had been doing well until recently. One night he wet the bed. I bought a water proof mattress cover. He had not had another accident until yesterday. He is on a pain patch, plus takes heavy duty pain meds, which makes him constipated. His doctor put him on meds to help him go. The first night on the pills, he had an accident in bed. I want to buy him depends, but I'm not sure what type are the best for his situation. Any suggestions?