Order: Cefaclor 187 mg PO BID for a child who weighs 20.5 lb. The recommended dosage is 20 mg/kg/day in two divided doses. Cefaclor is available in 187 mg/5 mL A) Childs weight: 20.5 lb / 2.2 = 9.3 kg b) Recommended daily dosage: 20 mg/kg/day x 9.3 kg = 186 mg/day c) Recommended single dosage: 186 mg / 2 = 93 mg/dose d) is the dosage safe? no, order 187 mg; single dosage 93 mg/dose e) if the dosage ordered is safe calculate the dose: no, overdosing

The prescribed dose of Cefaclor for a child weighing 20.5 lbs should be 93 mg/dose, not 187 mg. The higher dosage of 187 mg would result in overdosing the child with the antibiotic.

Explanation:

The subject of this question is in the field of medicine, specifically dealing with the safe administration of medications. In this particular question, the drug being asked about is Cefaclor, a common antibiotic. The problem revolves around the understanding of how to correctly calculate the proper dosage for a child weighing 20.5 lb. In order to do this, we must first convert the child's weight to kilograms by dividing it by 2.2, resulting in approximately 9.3 kg.

The recommended dosage of Cefaclor is 20 mg per kilogram per day, which can be divided into two doses. Multiplying 20 mg/kg/day by 9.3 kg (the child's weight in kilograms), results in a safe daily dosage of 186 mg. Because this daily dosage is divided into two doses, each dose given should be 93 mg.

In the given order, the dosage specified is 187 mg. This exceeds the calculated safe dosage of 93 mg. Thus, the prescribed dosage is not safe because it results in overdosing the child. The correct dosage would be 93 mg/dose.

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