In-vitro activity of ofloxacin against Chlamydia trachomatis.

The in-vitro activity of ofloxacin was evaluated against recently isolated Chlamydia trachomatis strains from patients suffering from non-gonococcal urethritis. The minimal inhibitory concentration (MIC) proved to be 1 mg/l against 8 of the 10 strains assayed (the MICs for the other two strains were 0.5 and 2 mg/l). The data obtained confirm that ofloxacin is active against Chlamydia trachomatis at concentrations achievable with the routine dosage regimen. The drug may thus be regarded as potentially useful for the treatment of non-gonococcal urethritis due to Chlamydia.