What Causes Blurred Vision And Aggressive Behaviour While On Xanax?

A friend is hospitized to get meds straighten out. She has MS and they took many away because she was confused. One that I know of is the valium which has tolerated well and put her on xanax. She i not tolerating it well . She has blurred vision ,irritable, head pain easily angered agressive behavior. It certainly isn t calming her down. She also has liver disease ( fatty liver which has caused damage from obesity over a period of time and heavy alcohol abuse . She no longer drinks and had bariatric surgery a couple of years ago. Given that why would they prescribe that med when can cause liver failure. They using Haldol IM also a cause of liver disease. When the fatty liver disease is in her chart. I told yo check to make sure.