Aztreonam concentrations in human prostatic tissue.

The concentrations of aztreonam in human prostatic tissue specimens obtained by transurethral resection were measured in nine patients after the intramuscular administration of a single 1-g dose. The average concentration of aztreonam was 7.8 microgram/g of prostate between 50 and 180 min after dosage. The average ratio of the drug concentration in prostate to that in serum was 0.25. The concentrations of aztreonam achieved were significantly higher than the MICs for most members of the family Enterobacteriaceae implicated in chronic prostatitis.