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Once-daily Dosing of Gentamicin in Obstetrics and Gynecology


Clinical Obstetrics and Gynecology: September 2008 - Volume 51 - Issue 3 - p 498-506
doi: 10.1097/GRF.0b013e31818091cd
New Antibiotics and Vaccines in Obstetric Practice

Gentamicin, an aminoglycoside with broad antimicrobial activity, is commonly used in both obstetrics and gynecology. Traditional dosing regimens for gentamicin have called for 3 times daily dosing, but recent insights into the pharmacodynamics of the drug have led to multiple studies of once-daily dosing regimens. Many studies have demonstrated efficacy, safety, and economy of the 24-hour dosing interval, resulting in recommendations that this become the standard for aminoglycoside administration. However, because of the unique considerations for drug administration in pregnant and postpartum women, the once-daily dosing regimens have not been widely adopted. Additional studies in pregnant and postpartum women have demonstrated therapeutic noninferiority, no increase in adverse events, and significant cost savings with once-daily dosing versus 3 times daily dosing of gentamicin. We review the literature and present rationale based on multiple controlled studies supporting single-daily dosing of gentamicin, 5 mg/kg/d actual body weight, for many common obstetrics-gynecology infections.

Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas

Regan N. Theiler is supported by the National Institutes of Health Women's Reproductive Health Research grant number NICHD5K12 HD001269-D9.

Correspondence: Regan N. Theiler, MD, PhD, Department of Obstetrics and Gynecology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555-0587. E-mail:

© 2008 Lippincott Williams & Wilkins, Inc.