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Discussion

dosage help

Can anyone walk me though this problem:

The physician orders vancomycin to infuse at 7.5 mg/kg/hr for a client weighing 50 kg. The pharmacy sends 750 mg/ 250 mL vancomycin in 0.9% normal saline. How long will this infusion last?

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Can anyone walk me though this problem:

The physician orders vancomycin to infuse at 7.5 mg/kg/hr for a client weighing 50 kg. The pharmacy sends 750 mg/ 250 mL vancomycin in 0.9% normal saline. How long will this infusion last?

First, figure your mg/kg/hr

7.5mg x 50kg=375mg/hr

750mg x 375mg

250ml.....x ml

750x = 93,750

x= 116.67ml/hr

125ml x 250ml

....1hr..........x

125x = 250

x=2 hr to infuse

  • Experts

the physician orders vancomycin to infuse at 7.5 mg/kg/hr for a client weighing 50 kg. the pharmacy sends 750 mg/ 250 ml vancomycin in 0.9% normal saline. how long will this infusion last?

dose desired:
7.5 mg/kg/hour, or 7.5 mg x 50 kg =
375 mg/hour

dose on hand:
750 mg in 250 ml

calculate:
750 m
g (total amount in iv bag)
divided by 375 mg
(amount to infused each hour) =
2 hours
(amount of time for iv bag to infuse at 375 mg/hour)

check:
375 mg
(1st hour)
+ 375 mg
(2nd hour)
= 750 mg
(total amount to infuse)

  • Experts
first, figure your mg/kg/hr

7.5mg x 50kg=350mg/hr

750mg x 350mg

250ml.....x ml

750x = 87,500

x= 116.67ml/hr

116.67ml x 250ml

....1hr..........x

116.67x = 250

x=2.14 hr to infuse

recheck your arithmetic.

Thanks Daytonite! I got the wrong answer on my calculator on that first step...whoops! Sometimes calculators aren't so helpful!:rolleyes:

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