QLexNursing

🔹 First, convert the child’s weight from pounds to kilograms, using 2.2 lb = 1 kg:

44 lb ÷ 2.2 = 20 kg.

🔹 The prescribed dose is 75 mg/kg/day, so calculate the total daily dose:

75 mg × 20 kg = 1,500 mg/day.

🔹 The order says this is to be divided into three doses (TID), so divide the daily dose by 3:

1,500 mg ÷ 3 = 500 mg per dose.

🔹 Therefore, the correct amount of medication the child should receive in one dose is 500 mg.

400 mg

🔹 This dose is too low compared to the calculated requirement of 500 mg per dose.

🔹 If 400 mg were given three times a day, the daily total would be 1,200 mg/day, which is less than the prescribed 1,500 mg/day.

🔹 Underdosing antibiotics like amoxicillin can lead to subtherapeutic levels, poor infection control, and potential resistance.

🔹 This option may result from incorrect division or miscalculation of the mg/kg step.

🔹 Therefore, 400 mg does not meet the ordered dose of 75 mg/kg/day.

250 mg

🔹 A 250 mg dose is only half of the correct calculated dose of 500 mg.

🔹 Given three times a day, this would total 750 mg/day, which is only 50% of the required 1,500 mg/day.

🔹 Such a low dose is significantly below the prescribed mg/kg recommendation and may fail to treat the infection effectively.

🔹 This error often occurs if someone mistakenly divides by 6 instead of 3 or confuses the daily and per-dose amounts.

🔹 Therefore, 250 mg is not an appropriate dose for this prescription.

750 mg

🔹 A 750 mg dose given three times a day would result in 2,250 mg/day, which exceeds the calculated requirement of 1,500 mg/day.

🔹 This represents overdosing, which increases the risk of side effects such as gastrointestinal upset, allergic reactions, or toxicity.

🔹 The error may occur if someone multiplies instead of divides when calculating TID from the daily dose.

🔹 Safe pediatric dosing requires strict adherence to ordered mg/kg/day limits to prevent harm.

🔹 Therefore, 750 mg per dose is too high and not correct.