On average , participants in the paliperidone palmitate group gained weight and those in the haloperidol decanoate group lost weight ; after 6 months , the least-squares mean weight change for those taking paliperidone palmitate was increased by 2.17 kg ( 95 % CI , 1.25-3 .09 ) and was decreased for those taking haloperidol decanoate ( -0.96 kg ; 95 % CI , -1.88 to -0.04 ) .