# Pharmacy IV drip calculation

by John D

(Indio, CA)

An IV has been ordered to run for 4 hours at 10gtt/min with a drop factor of 20 gtt/ml. The solution in the bag is 750mg of active drug dissolved in .5L of D5NS. How many mg of the active drug will the patient receive in two hours?

A. 45 mg

B. 60 mg

C. 90 mg

D. 120 mg

**Reply :**

by Jerry

by Jerry

This is question #1 from free quiz #4. It has a fair amount of fluff to de-code thru. It's a good example of what you coud expect on the

**PTCB**or

**ExCPT**exam. So, first write down all necessary factors, and then work toward the unknown variable.

Here's one way to do it:

First, convert hours to minutes:

**2 Hours = 120 Min**

Then, Figure out how many drips will drop in that time :

**120 Min x 10gtt/min = 1200gtt/duration**

Next Divide the drips by how many make up an mL :

**1200gtt ÷ 20gtt/mL = 60mL**

Lastly, Set-up a quick conversion against the IV solution :

750mg - - - - X

-------- = ----------

500mL - - - 60mL

750mg - - - - X

-------- = ----------

**cross-multiply for X**500mL - - - 60mL

Now, your turn...

**X =**

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