• T W Hahn, S W Henneberg, R J Holm-Knudsen, K Eriksen, S N Rasmussen, and M Rasmussen.
• Department of Pharmaceutics, Royal Danish School of Pharmacy, Universitetsparken, Copenhagen, Denmark.
• Br J Anaesth. 2000 Oct 1; 85 (4): 512-9.

AbstractTwenty-three children (aged between 9 weeks and 11 yr) were given paracetamol suppositories 25 mg kg-1 every 6 h (maximum 5 days) after major surgery and serum and saliva concentrations were measured. There was a good correlation (r = 0.91, P < 0.05) between saliva and serum concentrations. A one-compartment linear model with first-order elimination and absorption and lag-time was fitted to the data (ADAPT II). At steady state, the mean (SD) concentration was 15.2 (6.8) mg litre-1. Mean (SD) time to reach 90% of the steady state concentration was 11.4 (8.6) h. Body weight, age and body surface area were well correlated (P < 0.05) with clearance and apparent volume of distribution. There was no evidence of accumulation leading to supratherapeutic concentrations during this dosing schedule for a mean of approximately 2-3 days.

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