Question

You have an order for Erythromycin Suspension 100 mg/5 mL, 150

mL. In order to fill this order you will need to dilute _____ mL of
Erythromycin 200 mg/5 mL. Question 7 options:

Answer 1

To prepare a 150 mL suspension of Erythromycin 100 mg/5 mL from Erythromycin 200 mg/5 mL, you will need to dilute 75 mL of the stock solution.

Step-by-step explanation:

To calculate the amount of Erythromycin 200 mg/5 mL needed to prepare a 150 mL suspension of Erythromycin 100 mg/5 mL, we need to apply the concept of dilution in pharmacy calculations.

Firstly, we must determine the total amount of erythromycin required for the 150 mL of the final solution, which is
(150 mL / 5 mL) × 100 mg = 30 × 100 mg = 3000 mg

Since the stock solution is 200 mg/5 mL, to obtain 3000 mg of erythromycin, we would need:
(3000 mg / 200 mg) × 5 mL = 15 × 5 mL = 75 mL

Therefore, you would need to dilute 75 mL of the stock erythromycin solution to get the desired concentration of 100 mg/5 mL over the 150 mL volume.