Question

Order: Ampicillin 10 mg/kg/day in divided doses. Give every 4 hours. Available 100 mg/5 ml. The patient weighs 20 lbs 4 oz. How many mg will the patient receive per day? ml/dose?
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Answer #1

1 kg is equal to 2.2 lbs (pounds). If the patient is 20 lbs, then divide 20 by 2.2 pounds = 9.09kg

1 oz = 0.02 kg. so 4 oz = 0.08 kg

So, the total weight of the patient = 9.17 kg approximately

A. To calculate the total dose of the patient, multiply the ordered dose of Ampicillin (10mg/kg) with the actual weight ( 9.17) in kilogram.

9.17 x 10 = 91.7 mg of total dose receive/day.

B. Available dose of Ampicillin is 100mg/5ml. So, 1ml = 20mg

To calculate how many ml/dose the patient receive in a day. Take the total dose patient received in a day (91.7mg) divided by the strength of available dose (20mg/ml).

91.7 divided by 20mg/ml = 4.585 ml.

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