A patient weighing 40 lbs is to receive 100mg/kg/day of ampicillin. What is the total daily dose?

To determine the total daily dose of ampicillin for a patient weighing 40 lbs, you need to convert the weight from pounds to kilograms, as the dosage is given in mg per kg.

1. First, convert the patient's weight: Since there are approximately 2.2 pounds in a kilogram, you would divide the weight in pounds by 2.2 to get the weight in kilograms.

[

40 \text{ lbs} \div 2.2 \text{ lbs/kg} \approx 18.18 \text{ kg}

]

2. Next, you apply the dosage of 100 mg/kg. Multiply the weight in kg by the dosage:

[

18.18 \text{ kg} \times 100 \text{ mg/kg} = 1818 \text{ mg}

]

3. To express this in grams (since the choices are given in grams), convert milligrams to grams:

[

1818 \text{ mg} = 1.818 \text{ g}

]

Rounding 1.818 g to one decimal point gives approximately 1.8 g, which matches the provided answer.

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