Which dosing interval is common for aminoglycosides?

Which dosing interval is common for aminoglycosides?

• A. Every 8 hours
• B. Every 12 hours
• C. Every 24 hours
• D. Once daily

Answer: (A)

Aminoglycosides are dosed to balance effective bacterial killing with the risk of kidney and ear toxicity. They exhibit concentration-dependent killing, and their clearance depends largely on kidney function, so the goal is to deliver enough peak drug to kill bacteria while allowing trough levels to stay low to minimize toxicity. With normal renal function, a practical way to achieve that balance is to give the drug every 8 hours. This interval provides higher peaks for effectiveness while allowing time between doses for the drug to clear, helping keep troughs from rising too high. Although some regimens now use once-daily dosing to take advantage of the post-antibiotic effect, the most commonly taught and used interval in many settings is every 8 hours. If kidney function is reduced, clinicians adjust the interval to longer than 8 hours to prevent drug accumulation.

Aminoglycosides are dosed to balance effective bacterial killing with the risk of kidney and ear toxicity. They exhibit concentration-dependent killing, and their clearance depends largely on kidney function, so the goal is to deliver enough peak drug to kill bacteria while allowing trough levels to stay low to minimize toxicity. With normal renal function, a practical way to achieve that balance is to give the drug every 8 hours. This interval provides higher peaks for effectiveness while allowing time between doses for the drug to clear, helping keep troughs from rising too high. Although some regimens now use once-daily dosing to take advantage of the post-antibiotic effect, the most commonly taught and used interval in many settings is every 8 hours. If kidney function is reduced, clinicians adjust the interval to longer than 8 hours to prevent drug accumulation.