Singh et al performed a placebo-controlled comparison of paliperidone ER in three weight-based, fixed dosing (low-dose 1.5 mg/day, medium-dose 3 mg/day, and high-dose 6 mg/day).18 The mean change in PANSS score from baseline to endpoint (primary efficacy variable) was significant for medium-dose paliperidone ER, but not for the low-dose or high-dose groups versus placebo. The responder rate (percentage of patients with 20% or more reduction in PANSS total score from baseline to endpoint) was significantly higher in the medium-dose (64.6%) and high-dose (51.1%) groups, but not in the low-dose group (38.9%) versus placebo (33.3%). Somnolence, akathisia, insomnia, headache, and tremors were reported as the most common (>5%) adverse events associated with the paliperidone group.