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  • Title: Self-rated sedation and plasma concentrations of desmethyldiazepam following single doses of clorazepate.
    Author: Greenblatt DJ, Shader RI, Harmatz JS, Georgotas A.
    Journal: Psychopharmacology (Berl); 1979; 66(3):289-90. PubMed ID: 43553.
    Abstract:
    Plasma concentrations of desmethyldiazepam (DMDZ) and intensity of self-rated sedation (SRS) were measured at multiple points in time during 6 h after a single 15 mg oral dose of clorazepate dipotassium. Mean plasma DMDZ levels and mean SRS scores both became maximal at 1.0--2.5 h after drug dosage. By 6 h, however, mean SRS had returned to the predrug baseline score while mean DMDZ concentration fell only slighty from the maximum value. Disappearance of SRS despite persistence of high DMDZ levels might be due to adaptation or tolerance. If this is the case, subjective effects of benzodiazepines may depend upon duration of drug exposure as well as dose and concentration.
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