Therapeutic methods, kits, dosing regimens and uses as medicament are provided, for example, for the treatment of bacterial infection. The therapeutic methods can comprise intravenously administering to a subject who has a bacterial infection a pharmaceutical composition comprising a fixed amount of iclaprim. The administration of the fixed amount can achieve a Cmax(ss) below about 800 ng/mL, a T>；MIC of between about 30% to about 95% and a ratio of AUC/MIC of about 20 to about 85, and the bacterial infection can be treated. The fixed amount can be about 70 mg to about 100 mg. The pharmaceutical composition can be infused into the subject about 1 to about 3 times a day daily over a time period of about 0.75 hours to about 4 hours.
