@milrose2021 This is what you're up against. A fine example of dementia logic!We had two PWD at home with different presentations/issues.
MIL had dosset boxes for years but they didn't work too well as she was not orientated to days. We tried prompts but she would say that she had taken them and would argue that the days were wrong or that she had her own system of days. We found months worth of boxes hidden all over the house. We then tried an electronic dispenser for her but she was still insisting that it was wrong/ had given her them twice /she had already taken them and even went into kitchen to take them and put them in the bin! This went on for years. It is only now she is in a Nursing Home that she takes them daily. In total we had issues with her and medication for about 10 years.
FIL got mixed up with his medication as it changed monthly after warfarin blood tests - the more it altered the worse it got. We got the warfarin changed to Rivaroxaban and got dosset boxes. They didn't work too well so we got him an electronic dispenser which he loved, he always did like a gadget. He had his electronic box about 2 years before MIL and for 4 years in total. She got the tablets out for him everyday and he took them no problem. So even though she was used to the dispenser for her husband and continued to give him his tablets everyday until he went into care ( 6 months before her) she never engaged with it for herself.
I agree about regular reviews and removal of unnecessary medication - we also got everything to 'once a day' to minimise the battles with MIL but it still didn't work.