A physician orders 2gms of an antibiotic to be placed in 1000ml of D5W. Using a constituted injection that contains 300mg/2ml, how many mls should be added to the IV solution?

To answer this question, we need to calculate the number of milliliters of the constituted injection that contains 300mg/2ml required to achieve a concentration of 2gms (2000mg) in 1000ml of D5W.

First, let's calculate the total amount of constituted injection required by converting 2gms (2000mg) to milligrams:

2gms * 1000mg/g = 2000mg

Now, we need to find the amount of constituted injection needed to achieve a concentration of 2000mg in the IV solution.

Concentration of constituted injection = 300mg/2ml

To find out how much constituted injection is required, we can set up a proportion:

(300mg / 2ml) = (2000mg / X ml)

To solve for X, we can cross multiply and then divide:

300mg * X ml = 2ml * 2000mg

X = (2ml * 2000mg) / 300mg

X = 13.33 ml

Therefore, approximately 13.33 milliliters of the constituted injection should be added to the IV solution.