dosage help

[ajitamamasita]

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?

[beth66335, BSN, RN]

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

[Daytonite, BSN, RN]

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)

[Daytonite, BSN, RN]

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.

[beth66335, BSN, RN]

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