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Extended dosage intervals for aminoglycosides

D P Rodman¹, A J Maxwell, J T McKnight

¹Department of Clinical Pharmacy Practice, School of Pharmacy, Auburn University, AL.

American Journal of Hospital Pharmacy

|August 15, 1994

Summary

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Extended aminoglycoside dosing intervals are effective and may reduce toxicity. Once-daily administration leverages the postantibiotic effect (PAE) for potent bacterial killing while potentially lowering nephrotoxicity and ototoxicity risks.

Area of Science:

Pharmacology
Infectious Diseases
Clinical Pharmacy

Background:

Aminoglycosides are potent antibiotics with a short elimination half-life.
Concerns exist regarding aminoglycoside nephrotoxicity and ototoxicity with traditional dosing.

Purpose of the Study:

To discuss the rationale and effectiveness of extended dosage intervals for aminoglycosides.
To evaluate the impact of once-daily aminoglycoside administration on efficacy and toxicity.

Main Methods:

Review of the postantibiotic effect (PAE) of aminoglycosides.
Analysis of clinical trials comparing once-daily versus traditional aminoglycoside dosing regimens.
Examination of aminoglycoside pharmacokinetics and toxicity mechanisms.

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Main Results:

Aminoglycosides exhibit a prolonged PAE against various pathogens, supporting extended dosing.
Higher transient serum concentrations with once-daily dosing may reduce nephrotoxicity and ototoxicity.
Clinical trials suggest once-daily aminoglycoside administration is as effective as traditional regimens for gram-negative infections.
Once-daily dosing may decrease the frequency or delay the onset of aminoglycoside-related toxicities.

Conclusions:

Once-daily aminoglycoside administration is a viable and potentially safer alternative to traditional dosing.
Extended dosing intervals leverage the PAE and may mitigate toxicity risks in patients with normal renal function, renal dysfunction, or neutropenia.
Further research is warranted, but current evidence supports the efficacy and safety of once-daily aminoglycoside regimens.