Single oral dose trimethoprim pharmacokinetics were determined in 18 children aged 3 months to 13 years. Trimethoprim suspension was rapidly absorbed and quickly and widely distributed. The mean clearance was considerably faster and the elimination half life considerably shorter than values reported in adults. Only one third of the administered drug dose was recovered from the urine within 24 hours which is considerably less than in adults, suggesting that children may metabolise a greater proportion of the dose given. Urine trimethoprim concentrations greatly in excess of minimum inhibitory concentrations for common pathogens were rapidly achieved and sustained for at least 16 hours.
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