Pharmacokinetics of lndomethacin in the Premature Infant

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Abstract
Indomethacin (I) pharrnacokinetics was evaluated in 6 premature infants who received the drug for treatment of patent ductus arteriosus. Administered by oral or rectal route, I (0.2 mg/kg/24 h × 3) was promptly absorbed with peak plasma concentrations attained within 1 and 3 h, The elimination of I appeared to follow two compartment open model kinetics, with terminal plasma half-Jives ranging from 30 to 90 h. Apparent plasma clearance values were between 0.076 and 0.335 ml/min/kg. Ductal closure was observed in 4 of the 6 infants. Data point to a possible relationship between therapeu tic effects and I plasma concentrations.

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