My father (93) was taking meds for his heart (he survived a heart attack about 25 years ago). Due to new meds he has to take, they switched up the heart meds a couple of yeas ago to reduce interactions. Finally figured out that the heart meds were accelerating his mental issues, making him confused, angry, and belligerent. In discussions with his doctors, my sister (with our agreement) took him off the heart meds. It just seems better to let him enjoy his remaining time; he's too frail physically to get out & be active. He's in an apartment in a seniors facility (with meals). The place is populated with WWII & Korea vets, mostly Aggies. He's pretty happy now.