A nurse is providing discharge teaching to the parent of child who is prescribed diphenhydramine 75 mg elixir every 4 hr as needed. The amount available is diphenhydramine elixir 25 mg/2.5mL. 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.)
The Correct Answer is ["7.5"]
Determine the desired dose.
The nurse needs to administer 75 mg of diphenhydramine.
Calculate the available dose per 2.5 mL.
The available diphenhydramine is 25 mg/2.5 mL.
Calculate the volume to be administered.
Volume = Desired dose (mg) / Concentration (mg/2.5 mL) = 75 mg / (25 mg/2.5 mL) = 75 mg x (2.5 mL/25 mg) = 7.5 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["1.5"]
Explanation
Determine the desired dose per administration.
The nurse needs to administer 150 mg of lamivudine per dose.
Calculate the number of tablets per administration.
Each tablet contains 100 mg of lamivudine.
Number of tablets = Desired dose (mg) / Tablet strength (mg) = 150 mg / 100 mg/tablet = 1.5 tablets.
Correct Answer is ["8"]
Explanation
Rationale:
Determine the total volume to be infused.
The nurse is preparing to administer 150 mL of dextrose 5% in water (DW).
Calculate the infusion rate in mL/min.
The infusion time is 3 hours, which is equivalent to 3 x 60 = 180 minutes.
Infusion rate = Total volume / Infusion time = 150 mL / 180 min = 0.83 mL/min
Apply the drop factor to find the drip rate in gtt/min.
Drop factor of the tubing is 10 gtt/mL.
Drip rate = Infusion rate (mL/min) x Drop factor (gtt/mL) = 0.83 mL/min x 10 gtt/mL = 8.3 gtt/min
Round the drip rate to the nearest whole number.
Drip rate = 8 gtt/min
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