Good Evening P. Daughter;
I, too, am stage 3. Been on Rev but with other meds also. Fortunately I didn't have the side affects many do.
I don't know your Dad's age but I feel getting the kidneys back to normal function is very important right now. They have to process the over abundance of protein he is producing. In addition to the meds I was told to drink LOTS of water. He must flush the kidneys constantly.
Also get him to eat. Whether he tastes it or not. The body needs fuel to function.
Take care;
Kevin