British Journal of Anaesthesia, 2000, Vol. 85, No. 4 512-519
© 2000 The Board of Management and Trustees of the British Journal of Anaesthesia
Pharmacokinetics of rectal paracetamol after repeated dosing in children
1Department of Pharmaceutics and 3Department of Pharmacology, The Royal Danish School of Pharmacy, Universitetsparken 2, DK-2100 Copenhagen, Denmark. 2Department of Anaesthesiology, Copenhagen University Hospital, Blegdamsvej 9, DK-2100 Copenhagen, Denmark
Twenty-three children(aged between 9 weeks and 11 yr) were given paracetamol suppositories 25 mgkg1 every 6 h (maximum 5 days) after major surgery andserum and saliva concentrations were measured. There was a good correlation(r=0.91, P<0.05) between saliva andserum concentrations. A one-compartment linear model withfirst-order elimination and absorption and lag-time was fitted tothe data (ADAPT II). At steady state, the mean (SD)concentration was 15.2 (6.8) mg litre1. Mean (SD) time to reach 90% of the steady state concentrationwas 11.4 (8.6) h. Body weight, age and body surface area were wellcorrelated (P<0.05) with clearance and apparent volume ofdistribution. There was no evidence of accumulation leading tosupratherapeutic concentrations during this dosing schedule for a mean ofapproximately 23 days.
Br J Anaesth 2000; 85: 5129
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