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Pharmacy IV Calculation Question

by Victor

A patient is receiving an infusion that started at 1400 hours. The bag used contained 500mL of 0.25% active drug diluted into 0.9% NaCl. The infusion pump was set to deliver 75mL/Hr. The surgeon ordered that the infusion run until the patient receive 750mg of the active drug. What time will the infusion be terminated?
A. 6:00 p.m.
B. 9:00 p.m.
C. 10:00 p.m.
D. 12:00 a.m.

Comments for Pharmacy IV Calculation Question

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IV Calculations
by: Jerry

(in response to the entry right below)
Not exactly. First: 1400 is 2 PM.

For the Math:
First determine how many mg/hour is being infused:

[Think of this: 1000mg in 100mL is 1%,
so, 0.25% is a quarter of that in 100mL]

Then you can do a proportion math:

250mg - - - - - - - - - X (your mg/hour)
--------- = 0.25% = -------
100mL - - - - - - - - 75mL

Then divide 750mg by X (The infusion mg/hr) to get how many hours it will take.


This question has a bunch of filler, which you first have to filter out.

Basically, the question could just look like this:

A 0.25% solution is running at 75mL/hour. In how many hours will 750mg be infused? Then add that to 1400 and convert to o'clock hours.

IV Math
by: Anonymous

1400 hours is 3pm. 0.25 is 2500mg which is 0.25x1000.. then division is 2500÷750=3.333 Which Is 3 Hours So Answer Is A...Is The Math Correct On This Someone

If you do not know military time do not use it.
by: Anonymous

1400 is not 3pm It is 2pm

wrong answer
by: Anonymous

1400 is 2PM, and answer is 5PM

IV calculation
by: Brad Wojcik, Pharm D

750mg (100ml/0.25g)(1g/1000mg)(1 h/75mL) = 4 h.

1400 h + 4 h = 1800 h = 6 pm.

Note that I changed 0.25% w/v into 0.25% g/ml

Dividing by 100% to remove the %, we get 0.25 g/100 ml, which I flipped to get the 100 mL/0.25g

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