The most common adverse events ( placebo , paliperidone monthly ) were increased weight ( 4.7 % , 8.5 % ) , insomnia ( 7.1 % , 4.9 % ) , schizoaffective disorder ( 5.9 % , 3.0 % ) , headache ( 3.5 % , 5.5 % ) , and nasopharyngitis ( 3.5 % , 5.5 % ) .