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Practice Question

A nurse is preparing to administer diphenhydramine 12.5 mg PO every 6 hr. Available is diphenhydramine syrup 12.5 mg/5 mL. How many tsp should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer Choices:

Correct Answer:

1 tsp

Rationale:

🔹 The ordered dose (12.5 mg) exactly matches the strength in 5 mL, so the client needs 5 mL.

🔹 1 teaspoon = 5 mL, making the dose equal to 1 tsp.

🔹 Using teaspoon units ensures accurate household measurement.

🔹 No rounding is needed because the result is a whole number.

🔹 This dose matches safe pediatric administration guidelines for diphenhydramine.

2 tsp

🔹 Would give 10 mL = 25 mg, double the intended dose.

🔹 Risk of sedation or toxicity.

12.5 tsp

🔹 Extremely inaccurate—this would be 62.5 mL, a dangerous overdose.

🔹 Not mathematically related to ordered dose.

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This question is from NR 414 Medication Administration and Dosage Calculation Exam Pediatric and Adult Focus which contains 35 questions.

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From Exam
NR 414 Medication Administration and Dosage Calculation Exam Pediatric and Adult Focus

35 Questions

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Question Details
  • Category: RN Nursing Exam(s)
  • Subcategory: Examplify Exam(s)
  • Domain: Pharmacology
  • Answer Choices: 4
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