Which antibiotic class requires therapeutic drug monitoring due to nephrotoxicity and ototoxicity risks?

Which antibiotic class requires therapeutic drug monitoring due to nephrotoxicity and ototoxicity risks?

• A. Aminoglycosides
• B. Beta-lactams
• C. Macrolides
• D. Tetracyclines

Answer: (A)

The key idea is that some antibiotics have a narrow safety margin and notable toxicity risks, so doctors use therapeutic drug monitoring to balance getting enough drug to kill bacteria with avoiding damage to the kidneys and ears. Aminoglycosides—such as gentamicin, tobramycin, and amikacin—fit this pattern. Their effect depends on achieving sufficiently high concentrations to kill bacteria, but those same high concentrations can cause nephrotoxicity (kidney injury) and ototoxicity (hearing and balance problems) because the drug can accumulate in kidney cells and inner ear structures. Because of this, clinicians measure drug levels in the blood (peak and trough) after steady-state dosing and adjust the dose or dosing interval based on renal function and the levels obtained, aiming for an effective peak while keeping troughs low enough to minimize toxicity. The other antibiotic classes listed typically do not require routine drug-level monitoring because they generally have wider therapeutic indices, though monitoring may be used for specific cases.

The key idea is that some antibiotics have a narrow safety margin and notable toxicity risks, so doctors use therapeutic drug monitoring to balance getting enough drug to kill bacteria with avoiding damage to the kidneys and ears. Aminoglycosides—such as gentamicin, tobramycin, and amikacin—fit this pattern. Their effect depends on achieving sufficiently high concentrations to kill bacteria, but those same high concentrations can cause nephrotoxicity (kidney injury) and ototoxicity (hearing and balance problems) because the drug can accumulate in kidney cells and inner ear structures. Because of this, clinicians measure drug levels in the blood (peak and trough) after steady-state dosing and adjust the dose or dosing interval based on renal function and the levels obtained, aiming for an effective peak while keeping troughs low enough to minimize toxicity. The other antibiotic classes listed typically do not require routine drug-level monitoring because they generally have wider therapeutic indices, though monitoring may be used for specific cases.