Dosing Adjustments for Renal Impairment

Introduction to Dose Adjustment

For patients with creatinine clearance <50 mL/min, the ATS/CDC/IDSA guidelines recommend reducing dosing frequency to every 48 hours or reducing the dose, with a suggested dose of 750-1000 mg every 48 hours for tuberculosis treatment 1
The American Thoracic Society, Centers for Disease Control and Prevention, and Infectious Diseases Society of America recommend administering doses after hemodialysis on dialysis days 1
For patients with GFR <20 mL/min or hemodialysis, the recommended dose is 750-1000 mg three times weekly, with post-dialysis administration preferred to facilitate directly observed therapy 1

For most infections in patients with GFR ≥50 mL/min, a dose of 500 mg every 24 hours or 750 mg every 24 hours is recommended, depending on the indication 1
The ATS/CDC/IDSA guidelines recommend extending the dosing interval instead of reducing the dose to maintain efficacy, due to the concentration-dependent bactericidal activity of levofloxacin 1
For patients with creatinine clearance <30 mL/min, the ATS/CDC/IDSA guidelines recommend a dose of 750-1000 mg every 48 hours 1

Therapeutic drug monitoring is recommended in patients with borderline renal function (creatinine clearance 30-50 mL/min) to optimize dosing 1
Target serum concentrations at 2 and 6 hours post-dose can assist with dose optimization 1
The use of levofloxacin in patients with renal impairment should be guided by the principle of extending the dosing interval instead of reducing the dose, as stated by the Clinical Infectious Diseases guidelines 1
The Infectious Diseases Society of America recommends considering the patient's renal function when determining the dose of levofloxacin, with a dose adjustment required when creatinine clearance falls below 50 mL/min 2