Which formulation approach best mitigates amphotericin B nephrotoxicity?

• A. Lipid formulations only
• B. Pre-hydration only
• C. Conventional formulation with higher dose
• D. Lipid formulations and pre-hydration

Answer: (D)

Mitigating amphotericin B nephrotoxicity hinges on reducing renal exposure to the drug while supporting renal perfusion. Lipid-based formulations (such as liposomal or lipid complex forms) change the distribution of the drug, delivering antifungal activity with much less accumulation in the kidneys, which lowers the risk of tubular injury and decreased GFR. Prehydration with isotonic saline expands intravascular volume, improves renal perfusion, and reduces vasoconstriction of the afferent arteriole, all of which help preserve kidney function during treatment. Using both strategies together offers the greatest protection: the lipid formulation minimizes renal exposure, and prehydration provides hemodynamic protection, whereas conventional formulation at higher doses increases nephrotoxicity.