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Dronabinol effects on self-reported positive affect (top) and sedation (bottom) ratings as a function of time. Data are means (± S.E.M.) of daily maximum scores. Dronabinol/PBO was administered 4 times per day. Asterisks denote an increase from placebo (p< 0.01) in the indicated eight-day phase. VAS = Visual Analogue Scale; PBO = Placebo
