At what point would you set your pump if the doctor ordered Magnesium Sulfate 4gm IV to be given over 20 minutes?

The correct answer is 300ML/HR.
Since the stock comes at 40MG and you only need 1/10th of that:
4MG / 40 MG = 0.1
0.1 x 1000 =100
This means, 100ML
So you have 100ML over 20 minutes (100ML/20 min)
If it is 100ML/20, it is left for us to determine the equivalent in ML/hr
Since we have 60 minutes in 1 hour, we will multiple it by
60(1HR) / 20 MINUTES =3
3x 100ML
Final answer: 300ML/HR

The physician ordered Ritodrine IV 70mcg/min. The pharmacy sent up Ritodrine 150mg premixed in 500mL D5W.

Answer is 300ML/HR

4MG / 40 MG = 0.1

0.1 * 1000 =100

60(1HR) / 20 MINUTES =3

3*100

300ML/HR