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Nurs 4th Sem Mce A-fall 2025 Dosage Calculation (Montgomery College) ( 25 Questions)
Question 1 of 25 :
A nurse is providing discharge teaching to the parent of a child who is prescribed diphenhydramine 25 mg elixir every 4 hr as needed. The amount available is diphenhydramine elixir 12.5 mg/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Correct Answer: 10
Rationale:
Desired dose = 25 mg
Available concentration = 12.5 mg per 5 mL
Step 1: Set up proportion:
12.5 mg : 5 mL = 25 mg : X mL
Step 2: Cross multiply:
12.5 × X = 25 × 5
12.5X = 125
X = 125 ÷ 12.5 = 10 mL
Final Answer: 10 mL
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