A dose is 0.6 mg/kg per dose for a patient weighing 18 kg. The drug is supplied as 0.2 mg/mL. How many mL per dose?

• A. 18 mL
• B. 54 mL
• C. 36 mL
• D. 72 mL

Answer: (B)

To find the volume per dose, first convert the patient’s weight and dose to total milligrams: 0.6 mg/kg × 18 kg = 10.8 mg per dose. The solution is 0.2 mg/mL, so each milliliter provides 0.2 mg. The required volume is 10.8 mg ÷ 0.2 mg/mL = 54 mL. Therefore, each dose is 54 mL.