Levofloxacin Dosing Adjustments for Renal Impairment

Standard Dosing Approach for CrCl 30-50 mL/min

For patients with creatinine clearance of 39 mL/min, the American College of Cardiology is not applicable here, however, the Infectious Diseases Society of America recommends levofloxacin should be dosed at 500 mg loading dose followed by 250 mg every 48 hours, or alternatively 750-1000 mg three times weekly if treating tuberculosis or severe infections requiring higher exposures 1
Approximately 80% of levofloxacin is renally cleared, requiring dose adjustment to prevent drug accumulation in patients with moderate renal impairment (CrCl <50 mL/min but ≥30 mL/min) 2

Extending the dosing interval rather than reducing the dose is preferred because simply lowering the dose can compromise peak concentrations and treatment efficacy, as stated by the Infectious Diseases Society of America 1
Decreasing the dose lowers peak serum concentrations (Cmax), which can compromise efficacy, particularly for concentration-dependent killing, according to the Infectious Diseases Society of America 3, 1

If creatinine clearance drops below 30 mL/min, the Infectious Diseases Society of America recommends switching to the three-times-weekly dosing regimen (750-1000 mg) 3, 1
For patients with additional comorbidities or on multiple medications, closer monitoring is warranted as drug interactions and altered pharmacokinetics are more likely, as noted by the Infectious Diseases Society of America 3