A child weighing 27 kg is prescribed Keflex (cephalexin) 150 mg orally once daily. The recommended dose range for children is 25 to 50 mg/kg/day, and the medication label states 125 mg per 5 mL. What is the safe dosage range in milligrams per day for this child, and does the ordered dose fall within this range?
The safe range is 337.5 mg to 675 mg per day, the ordered dose of 150 mg once daily is above the safe range and may cause toxicity.
The safe range is 337.5 mg to 675 mg per day, the ordered dose of 150 mg once daily is within the safe range and acceptable.
The safe range is 675 mg to 1350 mg per day; the ordered dose of 150 mg once daily is below the safe range and likely subtherapeutic.
The safe range is 675 mg to 1350 mg per day, the ordered dose of 150 mg once daily is within the safe range and appropriate for the child.
The Correct Answer is C
Calculation:
- Identify the child’s weight and recommended dose range
Weight: 27 kg
Recommended dose: 25–50 mg/kg/day
- Calculate the safe dosage range
Minimum dose = 25 × 27
= 675 mg/day
Maximum dose = 50 × 27
= 1350 mg/day
Safe range = 675–1350 mg/day
- Compare the ordered dose to the safe range
Ordered Dose: 150 mg/day
150 mg is below the minimum recommended dose of 675 mg/day. The ordered dose is subtherapeutic and may not provide adequate treatment.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Enteral: Enteral administration involves delivering medication directly into the gastrointestinal tract, including oral, sublingual, or via feeding tubes. This route allows absorption through the digestive system and is commonly used for systemic effects.
B. Topical: Topical medications are applied to the skin, mucous membranes, or other body surfaces for local effect. They do not primarily utilize the digestive tract for absorption.
C. IV: Intravenous administration delivers medication directly into the bloodstream, bypassing the gastrointestinal tract entirely. It provides rapid systemic effect but is not considered enteral.
D. Parenteral: Parenteral administration refers to routes outside the gastrointestinal tract, such as subcutaneous, intramuscular, or intravenous injections. It bypasses digestion and absorption through the gut.
Correct Answer is D
Explanation
Calculation:
- Identify the ordered dose and tablet strength
Ordered Dose: 200 mg
Tablet Strength: 400 mg per tablet
- Calculate the number of tablets to administer
Number of Tablets = Ordered Dose ÷ Tablet Strength
Number of Tablets = 200 ÷ 400
= 0.5
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