Clinical effect and pharmacokinetics of trimethoprim-sulphadiazine in children with urinary tract infections

Eur J Clin Pharmacol. 1983;24(2):267-71. doi: 10.1007/BF00613830.


The clinical effect and pharmacokinetics of the combination trimethoprim (TMP)-sulphadiazine (SD) were studied in 18 children with acute urinary tract infections (UTI), aged 2-56 months. A suspension of TMP-SD (9 + 41 mg/ml) was taken orally twice daily for 10 days. Various doses of TMP (2.9-3.7 mg/kg/day) and SD (12.9-16.7 mg/kg/day) were also given to children of different ages. After 2-4 days of treatment, bacterial cultures of urine were negative and C-reactive protein in serum, WBC count and ESR in all patients had become normal. Steady state serum levels for both components were reached after 4 or more days of treatment. At steady state, mean peak serum concentrations of TMP and SD of 1.4 micrograms/ml and 27 micrograms/ml, respectively, were found within 2-4 h after a fasting morning dose. The biological half-lives of TMP and SD were of the same order of magnitude, but the total clearance of TMP was 5 times greater than that of SD. The concentrations of TMP-SD in urine were invariably more than 10 times the minimum inhibitory concentrations (MIC) for the causative organisms (tested at the ratios 1:20 and 1:4 of TMP and SD). Non-metabolized SD constituted 77% of total SD in urine of infants, and 55% of total SD in children of 1 year or more. The TMP-SD combination showed a satisfactory clinical effect and favourable pharmacokinetic properties in children with UTI.

MeSH terms

  • Anti-Infective Agents, Urinary / therapeutic use*
  • Bacteria / drug effects
  • Child, Preschool
  • Drug Combinations / metabolism
  • Drug Combinations / therapeutic use
  • Female
  • Humans
  • Infant
  • Kinetics
  • Male
  • Microbial Sensitivity Tests
  • Sulfadiazine / metabolism
  • Sulfadiazine / therapeutic use*
  • Trimethoprim / metabolism
  • Trimethoprim / therapeutic use*
  • Urinary Tract Infections / drug therapy*
  • Urinary Tract Infections / metabolism


  • Anti-Infective Agents, Urinary
  • Drug Combinations
  • Sulfadiazine
  • sulfadiazine, trimethoprim drug combination
  • Trimethoprim