In this 1-year trial, orlistat did not raise any safety issues, and the adverse event profiles—except for gastrointestinal tract adverse events—were similar between the orlistat and placebo groups. However, the efficacy and tolerability of orlistat for more than 1 year of treatment has only been confirmed in adults.Additional longer-term studies in a larger number of adolescents will be needed to confirm the safety of orlistat in this population. Gastrointestinal tract adverse events were reported by a higher proportion of orlistat-treated participants than placebo recipients, although the majority of the participants did experience a specific adverse event only once; these adverse events were generally mild to moderate in intensity and may relate to the mechanism of action of orlistat.However, they did not affect outcome as shown by similar BMI decreases in orlistat-treated participants with or without gastrointestinal tract adverse events. Gastrointestinal tract adverse events also occurred in a small percentage of placebo recipients, which has been previously reported in adult studies. This is consistent with the specific questioning for named gastrointestinal tract adverse events and also the known occurrence of gastrointestinal tract adverse events in obese patients not receiving any pharmacotherapy