[Co-trimoxazole concentration in the prostatic fluid of patients with subacute and chronic prostatitis].

Plasma and prostatic fluid (PF) concentrations of co-trimoxazol (TMP/SMZ) were investigated on 16 patients with subacute or chronic prostatitis. Co-trimoxazol-forte was given perorally, 2X 1 tablet (2X 160 mg TMP/800 mg SMZ), daily. TMP-concentrations in PF were 3.3 micrograms/ml and 2.6 micrograms/ml three and six hours after peroral application (days two and three) respectively. Compared to the concentrations of TMP in plasma, there was an increase by the factor 2.0-3.7. The corresponding concentrations of SMZ in PF were 7.7 micrograms/ml and 10.4 micrograms/ml 3 and 6 hours after medication--i.e. 32% of the plasma concentrations.