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Order: Cloxacillin 100 mg PO q8h for a child who weighs 39 lb.

The recommended daily dosage is 20-40 mg/kg/day every 8 hours. Cloxacillin is available at 125 mg/5 mL.

a. Child's weight: 17.7 kg

b. Recommended minimum daily dosage:
\[20 \, \text{mg/kg/day} \times 17.7 \, \text{kg} = 354 \, \text{mg/day}\]

c. Recommended minimum single dosage:
\[354 \, \text{mg/day} \div 3 \, \text{doses/day} = 118 \, \text{mg/dose}\]

d. Recommended maximum daily dosage:
\[40 \, \text{mg/kg/day} \times 17.7 \, \text{kg} = 708 \, \text{mg/day}\]

e. Recommended maximum single dosage:
\[708 \, \text{mg/day} \div 3 \, \text{doses/day} = 236 \, \text{mg/dose}\]

f. Is the dosage ordered safe?
No, the order is for 100 mg; the range is 118-236 mg/dose.

g. If the dosage ordered is safe, calculate the dose:
No, the order is not safe due to underdosing.

Answer :

Final answer:

The calculated dosage range for the child's weight is 118-236 mg per dose. The ordered dose of 100 mg is lower than this, indicating potential underdosing, and hence is unsafe.

Explanation:

The question involves calculating the appropriate dosage of cloxacillin according to a child's weight in kilos. Given the weight of the child is 39lb, that translates to 17.7 kg. The recommended dosage range for Cloxacillin is 20-40 mg/kg/day, divided every 8 hours.

To calculate minimum and maximum dosage limit:

  1. Minimum daily dosage: 20 mg/kg/day x 17.7 kg = 354 mg/day
  2. Minimum single dosage (divided into 3 doses every 8hrs): 354 mg /3 = 118 mg/dose
  3. Maximum daily dosage: 40 mg/kg/day x 17.7 kg = 708 mg/day
  4. Maximum single dosage (divided into 3 doses every 8hrs): 708 mg /3 = 236 mg/dose

The ordered dose of 100 mg is below the calculated minimum dosage of 118 mg/dose, making the ordered dose unsafe due to potential underdosing. Therefore, no dosage calculation should proceed since it it's not within the safe dosage range.

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