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iv problem

by karen
(indiana)

A patient is receiving an infusion from a 500 ml bag containing a 0.5% solution of drug solution.the drop factor is calibrated at 12 gtt/ml and the flow rate is set to 10 gtt/min. If the infusion is to run 4 hours, how much of the active drug will the patient receive ?

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Dimensional analysis method
by: Brad Wojcik, Pharm D

You are starting off with hours and have to end up with mg or g (we can use either one). The first step is to calculate how many g are in the 500 mL. 500ml(0.5g/100mL)= 2.5 g. Now you have a given, a bunch of ratios and the units of the answer. Just line everything up so that the units cancel out and you end up with g
4h(60min/h)(10gtt/min)(1mL/12gtt)(2.5g/500mL)=1g


correction
by: Anonymous

the answer to actually 0.2 grams.

the strength is 0.5% (0.5g/500mL). you used 2.5% (2.5g/500mL)

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