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Data (mean ± standard deviation) are shown for the Drug Effects Questionnaire (DEQ) question #5, “How high are you now?” after intravenous administration of morphine (n = 28), morphine plus naltrexone (n = 27), and placebo (n = 27) as a function of time (ordinate) since drug administration in the pharmacodynamic population. Data for (a) 12 hours and (b) 24 hours post-dose. VAS = visual analog scale.
