Lidocaine 0.4% 500mL is ordered to run at 30 gtts/min. How long will the bag last if a 15 gtts/mL tubing is used?

Question

pharmacy calculATIONS

Answer 1

Looks to be just a unit conversion problem:

 

500mL * 15 gtts/mL *(1/30) min/gtts

 

Cancelling the units we get:

 

500 (mL) * 15 (gtts/mL) * 1/30 (min/gtts)  <--- min leftover on the top, therefore our expression yield minutes

 

Evaluating the expression, the answer is:

 

250 minutes

 

source: http://www.nursingabc.com/Drug_Converter/drip_rate_problems.html