I was on risperdal for about a year and a half for schizoaffective and it worked well but it's beginning to poop out on me. They want to switch me to Invega because it's similar and the injection is once a month instead of every two weeks.I've decided to go through with it, but I'm wondering Is it so similar that it won't work (because now risperdal doesn't work)? Where are the differences and what should I expect?