Evaluation of recent pharmacokinetic data has suggested that a dose based on body surface area rather than body weight might be a better therapeutic regimen to achieve steady state plasma concentrations. The goal in this study was to determine if a Nevirapine suspension dose of 150 mg/m2 BID, following a two week lead-in of 150 mg/m2 QD, produces plasma nevirapine steady state concentrations of 4 - 6 ?g/mL in all age groups as was observed in adult safety and efficacy trials.