Gentamicin Administration Guidelines

Introduction to Gentamicin Administration

• Gentamicin is not available in a clinically useful oral formulation for systemic infections due to extremely poor oral bioavailability, and must be administered intravenously (IV) or intramuscularly (IM) for therapeutic effect, as recommended by the European Society of Cardiology 1, 2, 3.

Route of Administration

• Gentamicin is administered exclusively via IV or IM routes for treatment of systemic infections, including endocarditis, staphylococcal infections, and gram-negative bacterial infections, with a standard dosing of 3 mg/kg/day IV or IM in 2 or 3 divided doses, as suggested by the American Heart Association 1, 2, 3, 4.

Clinical Implications

• All major guidelines, including those from the American College of Cardiology, specify IV or IM administration only for gentamicin in treating endocarditis, staphylococcal infections, and other systemic bacterial infections 1, 2, 3, 4.
• Therapeutic drug monitoring (TDM) is essential when gentamicin is used, targeting trough concentrations <1 mg/L to minimize nephrotoxicity and ototoxicity, as recommended by the European Society of Cardiology 1.
• Peak serum concentrations should reach 3-4 μg/mL (when given in divided doses) or 10-12 μg/mL (when given as once-daily dosing) to ensure efficacy, according to the American Heart Association 1, 2.