The pharmacokinetics of chlorpromazine after intravenous infusion were studied in 25 children. The pharmacokinetic parameters studied are markedly different from those reported for adults. A clear relationship was demonstrated between age, serum terminal half-life (r = 0.75) and systemic clearance (r = -0.43). It appears that the pharmacokinetics of chlorpromazine are more rapid in children than in adults.