"been on this for 11 months for my bipolar 1. side effects have been very minimal compared to other anti-psychotic&#039;s i&#039;ve been on. i&#039;m on the 156mg every 28 days. i also take topamax, cogentin &amp; melatonin. i feel slowed down compared to when i was living in a manic state, but i&#039;m trying to get used to it. it&#039;s not a sleepiness but a lack of mania i feel. but i do feel sleepy between 5:30 &amp; 7pm i&#039;m guessing that&#039;s when the sustained part of the medication kicks in. i have had some moderate weight gain. i have had severe problems with muscle rigidity with other anti-psychotics, so i am super happy to find i don&#039;t have to go through that with invega sustaina! it did give me a big knot in my arm, so i get it in my butt now &amp; that&#039;s worked out better!"