A patient weighing 10 kg is prescribed 0.3 mg/kg of Drug X. The concentration is 1 mg/mL. How many milliliters should be administered?

A patient weighing 10 kg is prescribed 0.3 mg/kg of Drug X. The concentration is 1 mg/mL. How many milliliters should be administered?

• A. 3 mL
• B. 1 mL
• C. 0.5 mL
• D. 6 mL

Answer: (A)

Total amount of Drug X needed is found by multiplying the patient’s weight by the prescribed mg/kg dose, then converting that mg into mL using the concentration. For this patient: 10 kg × 0.3 mg/kg = 3 mg. With a concentration of 1 mg/mL, 3 mg equals 3 mL (since 1 mg per 1 mL). Therefore, administer 3 mL of Drug X.

Total amount of Drug X needed is found by multiplying the patient’s weight by the prescribed mg/kg dose, then converting that mg into mL using the concentration. For this patient: 10 kg × 0.3 mg/kg = 3 mg. With a concentration of 1 mg/mL, 3 mg equals 3 mL (since 1 mg per 1 mL). Therefore, administer 3 mL of Drug X.