Question

which of the following amounts of diluent should a pharmacy technician combine with a 1-ml vial containing 125 mcg of digoxin to achieve 50 mcg/ml?

1.5 ml
3.5 ml
0.5 ml
2.5 ml

Explanation:

Calculate the required total volume

Using the Pharmacy Calculations knowledge point

$$ \text{Total Volume} = \frac{125\text{ mcg}}{50\text{ mcg/mL}} = 2.5\text{ mL} $$

Determine the volume of diluent to add

Using the Pharmacy Calculations knowledge point

$$ \text{Diluent Volume} = 2.5\text{ mL} - 1\text{ mL} = 1.5\text{ mL} $$

Answer:

• (A) 1.5 mL (Correct answer)
• (B) 3.5 mL
• (C) 0.5 mL
• (D) 2.5 mL