Acyclovir-Induced Nephrotoxicity and Side Effects
Kidney-Related Side Effects
- This reversible nephropathy typically manifests after 4 days of intravenous therapy and can affect up to 20% of patients 1
- Patients with pre-existing renal impairment are at substantially increased risk and require dose adjustment 2
Dose Adjustments for Kidney Disease
- For patients with chronic kidney disease, acyclovir dosing must be reduced based on creatinine clearance, with specific adjustments for CrCl 25-50 mL/min, 10-24 mL/min, and <10 mL/min 2, 3
The following dose adjustments are recommended:
CrCl Oral Dose IV Dose 25-50 mL/min Standard oral dose Every 12 hours 10-24 mL/min Every 8 hours Every 24 hours <10 mL/min Every 12 hours 2.5-5 mg/kg every 24 hours Hemodialysis patients 2.5-5 mg/kg every 24 hours, dosed after dialysis Other Serious Adverse Effects
Thrombotic thrombocytopenic purpura/hemolytic uremic syndrome (TTP/HUS) has occurred in immunocompromised patients, resulting in death, and represents a rare but critical complication requiring immediate recognition 1
Common Side Effects
- Nausea, vomiting, and diarrhea can occur but are typically not severe 1
- Headache and dizziness are commonly reported 1
Critical Prevention Strategies
- Avoid rapid IV bolus administration; infuse slowly over at least 1 hour 2
- Adjust doses appropriately for any degree of renal impairment 2, 3
- The American College of Physicians and other medical societies recommend maintaining adequate hydration, monitoring renal function, and calculating IV acyclovir doses based on ideal body weight to minimize nephrotoxicity risk 1, 2