What weight do you use for aminoglycoside dosing?
If the patient isn’t obese, IBW is used. However, if the patient’s total body weight is >120% of IBW, adjusted body weight must be calculated and used. If the patient’s total body weight is less than IBW, total body weight is used for the dosing weight.
Why are aminoglycosides given once-daily?
Once-daily aminoglycoside dosing is an effective, well-established method to achieve therapeutic efficacy while limiting the risk of toxicity and simplifying the processes of dosing and monitoring.
How does the once-daily dosing affect aminoglycoside toxicity?
Numerous in-vitro and animal studies have supported using once-daily aminoglycoside dosing. Clinical studies show at least equal effectiveness and no greater toxicity when compared with traditional regimens.
When do you use extended interval aminoglycoside and dosing?
Extended interval aminoglycoside dosing (EIAD )is preferred over traditional dosing in patients that meet EIAD eligibility criteria. EIAD typically employs a daily dose of 7 mg/kg (5 mg/kg/day for UTI is reasonable) and is usually dosed q24h in patients with normal renal function.
How are aminoglycosides dosed?
The traditional approach to parenteral aminoglycoside dosing in adults involves the administration of a weight-based dose divided two to three times daily in patients with normal renal function.
How are aminoglycosides administered?
Aminoglycosides are broad-spectrum antibiotics used to treat infections caused by gram-negative aerobic bacilli. While less common, aminoglycosides (in combination with other drugs) have also been used for select gram-positive infections. They are typically administered intravenously, while some can be taken orally.
Can gentamicin be given once-daily?
A once-daily dosing regimen of gentamicin is at least as effective as and is less nephrotoxic than more frequent dosing.
How can you prevent aminoglycoside nephrotoxicity?
To minimize the risk of nephrotoxicity, select loading and maintenance aminoglycoside dosages based on estimated creatinine clearance. Also, monitor peak and trough serum aminoglycoside levels, replenish volume, and correct potassium and magnesium abnormalities.
When do you give aminoglycosides?
(1) Aminoglycosides should be used only when their unique antibiotic potency is needed, such as treatment of infection in critically ill patients, and in nosocomial infections or infections with organisms resistant to less toxic therapies.
How do you monitor aminoglycosides?
Using a nomogram is a popular method of monitoring aminoglycoside treatment if extended interval dosing is being followed. Commonly used nomograms include the Hartford nomogram and Urban and Craig nomogram. All nomograms are designed for a certain population group with a fixed dose of aminoglycoside.
How often is IV gentamicin given?
The FDA-approved dosage is 2.5 mg/kg/dose IV or IM every 12 hours. 2.5 mg/kg/dose IV or IM every 18 to 24 hours for at least 6 weeks plus a beta-lactam. The FDA-approved dosage is 2.5 mg/kg/dose IV or IM every 12 hours; however, this dosing does not account for gestational age or birthweight.
How do you calculate gentamicin?
The dose is calculated using these assumptions:
- CrCl > 40ml/min at 5mg/kg dose to a maximum of 500mg.
- CrCl 10-40ml/min at 3mg/kg dose to a maximum of 300mg.
- CrCl <10ml/min at 1mg/kg dose to a maximum of 120mg.
- Round the dose up or down to the nearest 20mg increment for doses less than 200mg and 40mg above this.
Is once-daily aminoglycoside dosing an effective method of dosing?
Once-daily aminoglycoside dosing is an effective, well-established method to achieve therapeutic efficacy while limiting the risk of toxicity and simplifying the processes of dosing and monitoring. Once-daily aminoglycoside dosing: An update on current literature
How is an aminoglycoside regimen calculated?
This regimen can be completely empiric, where the dose is based on body weight, height, and creatinine clearance, or a regimen may be calculated based on one or more drug levels. This calculator was specifically designed to help students and clinicians understand the process of calculating an aminoglycoside regimen.
How much Aminoglycoside can you take on dialysis?
Patients on renal replacement (hemodialysis, peritoneal dialysis, CVVHD) Dosing for Aminoglycoside High Dose Extended Interval Method Drug Cr Cl or eGFR ≥ 60 ml/min Cr Cl or eGFR 40 – 59 ml/min Gentamicin Tobramycin 5- 7 mg /kg INT-Q24H (round dose to the nearest 10mg) 5-7 mg/kg INT-Q 36 – 48H (round dose to the nearest 10mg)
When should aminoglycoside be dosed for nephrotoxicity?
If the serum creatinine increases by 0.5 mg/dL or 30% increase from baseline, traditional dosing is warranted. Study results show that aminoglycoside administration during afternoon time periods have the lowest occurrence of nephrotoxicity.