Pharmacokinetics of meloxicam in patients with juvenile rheumatoid arthritis.

The pharmacokinetics of a meloxicam suspension were studied in 18 children with juvenile rheumatoid arthritis. Children received a single 0.25-mg/kg dose up to a maximum of 15 mg. Pharmacokinetic parameters after the first dose were calculated by noncompartmental methods. Geometric mean (percent coefficient of variation for geometric mean [gCV]) C(max), AUC(0- infinity ), apparent clearance, apparent volume of distribution, and elimination half-life values were 1.24 microg/mL (47% gCV), 25.6 microg x h/mL (81% gCV), 0.17 mL/min/kg (83% gCV), 0.19 L/kg (63% gCV), and 13.4 hours (54% gCV) in the younger group and 1.89 microg/mL (25% gCV), 35.8 microg x h/mL (21% gCV), 0.12 mL/min/kg (23% gCV), 0.13 L/kg (22% gCV), and 12.7 hours (21% gCV) for the older group, respectively. Area under the curve, volume of distribution, and clearance tended to be higher in the younger group, whereas elimination half-lives were similar. A post hoc comparison to pharmacokinetic data in adults revealed no relevant differences. Thus, a common body weight-normalized dose is considered appropriate for children older than 2 years.