A dog weighing 50 pounds is given fenbendazole at 50 mg/kg PO for 3 days using a 10% suspension. How many milliliters should be given per dose?

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Multiple Choice

A dog weighing 50 pounds is given fenbendazole at 50 mg/kg PO for 3 days using a 10% suspension. How many milliliters should be given per dose?

Explanation:
The main idea is converting weight to the dose and then turning that dose into a volume using the suspension’s concentration. Start by turning the dog’s weight into kilograms: 50 lb is about 22.7 kg. The prescribed dose is 50 mg per kg, so per dose you need 22.7 kg × 50 mg/kg ≈ 1,135 mg of fenbendazole. The 10% suspension provides 100 mg per milliliter, so the volume needed is 1,135 mg ÷ 100 mg/mL ≈ 11.35 mL. Rounding gives about 11.4 mL per dose. Since the regimen is for 3 days, this same amount is given once each day for three days. The key steps are kg conversion, mg/kg dosing, and converting mg to mL with the suspension’s concentration.

The main idea is converting weight to the dose and then turning that dose into a volume using the suspension’s concentration. Start by turning the dog’s weight into kilograms: 50 lb is about 22.7 kg. The prescribed dose is 50 mg per kg, so per dose you need 22.7 kg × 50 mg/kg ≈ 1,135 mg of fenbendazole. The 10% suspension provides 100 mg per milliliter, so the volume needed is 1,135 mg ÷ 100 mg/mL ≈ 11.35 mL. Rounding gives about 11.4 mL per dose. Since the regimen is for 3 days, this same amount is given once each day for three days. The key steps are kg conversion, mg/kg dosing, and converting mg to mL with the suspension’s concentration.

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