HESI RN
RN Hesi Med Surg Dosage Calculations Questions
Extract:
Question 1 of 5
A client who weighs 176 pounds receives a prescription for lorazepam 0.05 mg/kg intramuscularly 2 hours before a scheduled procedure. The medication is available in 4 mg/ml vial. How many ml should the nurse administer? (Enter numerical value only.)
Correct Answer: 1
Rationale: Weight: 176 / 2.2 = 80 kg. Dose: 0.05 mg/kg × 80 = 4 mg. Volume: 4 / 4 = 1 mL.
Question 2 of 5
A client receives a prescription for amoxicillin 2 g/clavulanate 125 mg by mouth every 12 hours for 10 days. The medication is available in 1000 mg/62.5 mg extended release tablets. How many tablets should the nurse administer? (Enter numerical value only.)
Correct Answer: 2
Rationale:
Total dose = 2000 mg amoxicillin + 125 mg clavulanate. Tablet strength = 1000 mg/62.5 mg. Tablets = (2000 + 125) / (1000 + 62.5) = 2 tablets.
Question 3 of 5
An adult client receives a prescription for diphenhydramine 15 mL by mouth every 12 hours PRN for pruritus. The bottle is labeled, diphenhydramine 12.5 mg/5 mL. What is the total daily dose in mg that the client receives? (Enter numerical value only.)
Correct Answer: 75
Rationale:
To find the total daily dose, calculate the mg per dose: 12.5 mg/5 mL means 15 mL contains (12.5 × 15) / 5 = 37.5 mg. The prescription allows two doses daily (every 12 hours PRN), so 37.5 × 2 = 75 mg/day.
Question 4 of 5
The healthcare provider prescribed 2 liters of 5% Dextrose in water (DW) to infuse in 24 hours. The IV administration set delivers 15 gtt/mL. How many ml/hour should the nurse program the infusion pump? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
Correct Answer: 83
Rationale: Infusion rate = 2000 mL / 24 hours = 83.333 mL/hour, rounded to 83.
Question 5 of 5
The healthcare provider prescribes metoclopramide 7.5 mg/mL IM every 3 hours PRN vomiting for a client who is receiving chemotherapy. The nurse prepares an injection using a 2 ml. prefilled syringe cartridge labeled, 'metoclopramide 5 mg/mL.' How many mL should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
Correct Answer: 1.5
Rationale: Volume = 7.5 mg / 5 mg/mL = 1.5 mL.