Does the person you're caring for insist they've already taken their medication even if their pill is still in the box?
My mom has frontal lobal dementia. I fill her pill box once a week. She only takes a thyroid pill and an acid reducer. She also uses two inhalers in the morning and one in the evening. She has a rescue inhaler that she uses too often, because she insists that she has used her maintenance medication, although she clearly has not. I can tell by the numbered puffs on the inhaler.