We evaluated blood concentrations of three nonbarbiturate sedative-hypnotics in 19 nonfatal (NF) and five fatal (F) intoxications which were "pure" (i.e. which involved only one drug each): glutethimide, 4 (NF), 3 (F); meprobamate, 9 (NF), 1 (F); and methyprylon, 6 (NF), 1 (F). For each of the 24 cases, both a comprehensive toxicology panel (including blood and urine) and the clinical history established that only a single drug had been ingested. Blood drug concentrations showed statistically significant correlation with the level of consciousness for nonfatal meprobamate intoxication (p less than 0.01) and nonfatal methyprylon intoxication (p less than 0.05). Blood glutethimide concentrations did not show such correlation. Death was associated with a mean blood glutethimide concentration in excess of 4.0 mg/dL, a blood meprobamate concentration of 20.5 mg/dL, and a blood methyprylon concentration of 11.7 mg/dL. Interpretation of blood concentrations of these compounds is discussed, and physical findings and demographic data are presented.
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