My cousin is a schizophrenic and he "snapped", so to speak, when he and my aunt came for a visit. He went from being my cousin Jim, normal in every way, to someone who was absolutely terrified that the mafia was out to kill him. It was very frightening to see the transformation that took place over a couple of days. Eventually my aunt had to have the police come and arrest him which got him detained and committed until he could be diagnosed. When medicated, he is like a zombie, and he needs to be medicated or the paranoia comes back and he is liable to do anything.
My doctor felt that I was dealing with a lot of anxiety, so he prescribed Zoloft. I agreed to try it and within a week I was a zombie. He convinced me to cut the dose in half and it wasn't that bad, but after a month or so, when it had taken full effect, I found that I couldn't do my usual word games on my Kindle. I was missing words like cat and dog and I was on a very light dose. My point is that when people with a mental illness are medicated, their quality of life can be diminished so greatly that they will often stop the medicine because it is better to deal with the symptoms rather than the cure. All too often, the medical community is more concerned with curing the symptoms rather than finding the cause.