A pediatric client weighing 33 \text{ lb} is diagnosed with acute otitis media. The primar… — NCLEX-PN

A pediatric client weighing $33 \text{ lb}$ is diagnosed with acute otitis media. The primary healthcare provider prescribes amoxicillin $80 \text{ mg/kg/day}$ by mouth, to be administered in two equally divided doses. The pharmacy dispenses a powder for oral suspension with the manufacturer instructions: 'Reconstitute with $68 \text{ mL}$ of purified water to yield a final volume of $100 \text{ mL}$ and a concentration of $400 \text{ mg}/5 \text{ mL}$ .' Based on this prescription, how many milliliters should the nurse administer for a single dose? (Record answer to the nearest tenth. Do not include units in answer.)

Answer: 7.5 mL

Answer

7.5

The correct dose is calculated by first converting the child's weight to kilograms (

33 \text{ lb} / 2.2 = 15 \text{ kg}

). Next, the total daily dose is found by multiplying the weight by the prescribed rate (

15 \text{ kg} \times 80 \text{ mg/kg/day} = 1200 \text{ mg/day}

). Since the medication is divided into two doses, the single dose requirement is

600 \text{ mg}

. Finally, using the supplied concentration of

400 \text{ mg}

per

5 \text{ mL}

, the required liquid volume is calculated as

600 \text{ mg} \times (5 \text{ mL} / 400 \text{ mg}) = 7.5 \text{ mL}

Step-by-Step Solution

Convert the client's weight from pounds to kilograms.

15 \text{ kg}

The prescribed dosage is weight-based in mg/kg, so the weight must first be converted by dividing pounds by 2.2 (

33 \div 2.2 = 15

Calculate the total daily medication dose.

1200 \text{ mg/day}

Multiply the client's weight in kilograms by the prescribed daily amount (

15 \text{ kg} \times 80 \text{ mg/kg/day} = 1200 \text{ mg/day}

Determine the required milligrams for a single dose.

600 \text{ mg/dose}

The total daily dose is prescribed to be given in two equally divided doses, so it must be divided by 2 (

1200 \text{ mg} \div 2 = 600 \text{ mg/dose}

Calculate the liquid volume to administer per dose.

7.5 \text{ mL}

Use the final concentration ratio (

400 \text{ mg}/5 \text{ mL}

) to find the volume:

600 \text{ mg} \times (5 \text{ mL} / 400 \text{ mg}) = 7.5 \text{ mL}

. The diluent volume (

68 \text{ mL}

) and total bottle volume (

100 \text{ mL}

) are distractor data points not used in calculating the individual dose.

Key Concept

Weight-based pediatric dosage calculation and filtering of extraneous reconstitution data.

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