How do you extrapolate vancomycin trough?

To increase the therapeutic utility of an early vancomycin trough concentration, an estimate of the true trough can be determined by extrapolating the measured value using e−Kt, where K = CrCl × 0.00083 + 0.0044 and t is the time difference in hours.

How do you calculate half life for vancomycin?

Other pharmacists use the half-life (t1/2) equation (t1/2 = 0.693/Kel) to estimate how long to wait to reach the goal trough, using the Matzke equation to calculate the elimination constant (Kel) for vancomycin1: Kel=0.00083×(CrCl)+0.0044, Thus,t1/2=0.6930.00083×(CrCl)+0.0044.

How do you calculate AUC MIC ratio for vancomycin?

The empiric AUC:MIC ratio for a vancomycin dosing regimen can be predicted in advance by a simple formula: First, divide the total daily dose of vancomycin by the estimated clearance of vancomycin. Then divide this number by the MIC.

How do you calculate vancomycin ke?

Again, based on population kinetics, it has been determined that we can estimate k e with the equation 0.00083*CrCl + 0.0044.

When should you hold vancomycin?

To improve antibiotic penetration and optimize the likelihood of achieving pharmacokinetic and pharmacodynamic targets, trough levels of 15 to 20 mg/L are recommended for pathogens with a vancomycin minimum inhibitory concentration (MIC) of 1 mg/L or higher and for complicated infections such as endocarditis.

What are side effects of vancomycin?

Side Effects

  • Black, tarry stools.
  • blood in the urine or stools.
  • continuing ringing or buzzing or other unexplained noise in the ears.
  • cough or hoarseness.
  • dizziness or lightheadedness.
  • feeling of fullness in the ears.
  • fever with or without chills.
  • general feeling of tiredness or weakness.

How long does vancomycin stay in your system?

In healthy patients, the half-life of vancomycin is between 4 to 6 hours; in patients lacking functional kidneys, the half-life can be as long as 7.5 days.

What is a good mic for vancomycin?

Abstract. Background: Guidelines recommend that agents other than vancomycin be considered for some types of infection due to methicillin-resistant Staphylococcus aureus (MRSA) when the minimum inhibitory concentration (MIC) to vancomycin is 2 μg/mL or more.

When do you use AUC vancomycin?

AUC vancomycin dosing represents the total vancomycin concentration in the blood over a period of time, usually over 24 hours. In order to calculate this manually: Two vancomycin levels need to be drawn when the patient’s vancomycin is at a stable concentration, usually referred to as steady-state.

What is the normal range for vancomycin trough?

Vancomycin is an antibiotic drug used to treat serious, life-threatening infections by gram-positive bacteria that are resistant to less-toxic agents. The reference range for vancomycin trough levels is 5-15 mcg/mL.

What are the side effects of vancomycin?

What is the most serious side effect of vancomycin?

Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: ringing in the ears, hearing problems, change in the amount of urine, easy bleeding/bruising, fever, persistent sore throat, persistent diarrhea.