I want the doctor to stop Ativan, but he won't listen!.

My grandmother is 95 years old and has dementia. She has a doctor who has her on Risperdal twice a day. If she has a 'mean' fit, they give her Ativan. I have asked to the Ativan stopped because I feel she is being overdosed by both drugs. I looked up the drugs and the FDA says to not use the drugs for dementia. When my grandmother is on Risperdal, she does okay. She can still eat, drink, and go to the bathroom by herself, as well as walk. She is also very vocal with knowing her family and friends. If there is a problem at night, they give her a shot of Ativan, and then she is not able to function for three days. I have looked up both drugs. Ativan is not an option that I or my family want to take, but I need more help to show this to the doctor. No one will listen to me. I have her Power of Attorney. She is the love of my life - can you help me? Her granddaughter, Katy