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Median (n=11) 11-hydroxy-THC (11-OH-THC)/delta-9-tetrahydrocannabinol (THC) ratios during 1st (D1) and 5th (D5) days of 0, 30, 60 and 120 mg/day dronabinol and single smoked cannabis challenge at 11:30 on Day 5. Arrows indicate time of dronabinol administration.
