A 40 lb dog requires a dose of 20 mg/kg using a 15% solution. How many milliliters should be drawn up?

A 40 lb dog requires a dose of 20 mg/kg using a 15% solution. How many milliliters should be drawn up?

• A. 1.2 mL
• B. 1.8 mL
• C. 2.0 mL
• D. 2.4 mL

Answer: (D)

The calculation relies on converting weight to kilograms, applying mg/kg dosing, and using the solution’s percent strength to convert mg to milliliters. First, convert the dog’s weight: 40 lb divided by 2.2046 ≈ 18.1 kg. Multiply by the dose: 18.1 kg × 20 mg/kg ≈ 362 mg to be given. A 15% solution has 150 mg per milliliter (15 g per 100 mL equals 150 mg/mL). To find the volume needed, divide the dose by the concentration: 362 mg ÷ 150 mg/mL ≈ 2.41 mL. Rounding to a practical value gives about 2.4 mL to draw up.

The calculation relies on converting weight to kilograms, applying mg/kg dosing, and using the solution’s percent strength to convert mg to milliliters.

First, convert the dog’s weight: 40 lb divided by 2.2046 ≈ 18.1 kg. Multiply by the dose: 18.1 kg × 20 mg/kg ≈ 362 mg to be given. A 15% solution has 150 mg per milliliter (15 g per 100 mL equals 150 mg/mL). To find the volume needed, divide the dose by the concentration: 362 mg ÷ 150 mg/mL ≈ 2.41 mL. Rounding to a practical value gives about 2.4 mL to draw up.