Dronabinol is a synthetic cannabinoid taken by mouth.Possible side effects include:For prochlorperazine: Blurred visionDrowsinessDizzinessRestlessness or need to keep movingShuffling walkStiffness of arms or legsTrembling and shaking of hands and fingersFor ondansetron: ConstipationDiarrheaFeverHeadacheUnusual tiredness or weaknessFor granisetron: ConstipationDiarrheaHeadacheUnusual tiredness or w