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  • 1
    ISSN: 1432-1041
    Keywords: Bezitramide ; oral absorption profile ; pharmacokinetics ; male volunteers ; experimental pain ; biliary excretion in rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The oral absorption of bezitramide 5 mg was studied in 7 human volunteers, using a specific radioimmuno-assay which measured both bezitramide and its active metabolite R-4618. A lag time of 0.5–1.0 h and a Cmax of 5.4 ng/ml plasma were found, the latter occurring 2.5–3.5 h after administration. The apparent elimination half-life varied from 11 to 24 h. Less than 0.3% of the dose was excreted unchanged in the urine. High concentrations in the faeces of some individuals indicate incomplete absorption and/or biliary secretion. The analgesic effect, using a standardized superficial electrical stimulation method, reached its maximum between 2.5 and 3.5 h after dosing, in accordance with the absorption phase. The duration of the effect was highly variable. Experiments in rats (n=6,3H-bezitramide 2.5 µg), demonstrated extensive biliary excretion (up to 70% of total radioactivity) and less than 3% of the label was removed by urinary excretion.
    Type of Medium: Electronic Resource
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