ATI Dosage calculation lpn maternal newborn proctored assessment 3.2
Calculation
A nurse is reviewing a new prescription for propranolol 20 mg PO four times daily for a client who has premenstrual migraine headaches. Available is propranolol solution 4 mg/mL. The nurse should recognize that the client should take how many mL per dose? (Round the answer to the nearest whole number. Use a leading zero If it applies. Do not use a trailing zero.)
mL
Explanation & Rationale
Given: Prescribed dose: 20 mg of propranolol per dose Available concentration: 4 mg/mL Steps to solve: Determine the volume to be administered: Set up a proportion to solve for the unknown volume (X): 4 mg/mL = 20 mg/X mL Cross-multiplying gives us: 4 mg x X mL = 20 mg x 1 mL Simplifying: 4X = 20 Solving for X: X = 20 / 4 = 5 mL
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