A medication order is 150 mg. The vial provides 25 mg in 5 mL. How many milliliters should be drawn to administer 150 mg?

A medication order is 150 mg. The vial provides 25 mg in 5 mL. How many milliliters should be drawn to administer 150 mg?

• A. 25 mL
• B. 30 mL
• C. 10 mL
• D. 15 mL

Answer: (B)

Converting a labeled concentration to the required dose by using the ratio of mg to mL. The vial has 25 mg in 5 mL, which means the concentration is 25 mg / 5 mL = 5 mg per mL. To deliver 150 mg, divide 150 mg by 5 mg/mL, giving 30 mL. Double-check: 30 mL × 5 mg/mL = 150 mg. So 30 mL should be drawn.

Converting a labeled concentration to the required dose by using the ratio of mg to mL. The vial has 25 mg in 5 mL, which means the concentration is 25 mg / 5 mL = 5 mg per mL. To deliver 150 mg, divide 150 mg by 5 mg/mL, giving 30 mL. Double-check: 30 mL × 5 mg/mL = 150 mg. So 30 mL should be drawn.