Dosage Calculations HESI Test Bank

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Sample questions from Dosage Calculations HESI Test Bank

This material has 90 questions with answers and rationales. Here are the first 5.

1. 1.The provider prescribes amoxicillin 500 mg PO. Available are 250-mg capsules. How many capsules should the nurse administer?

   • A.1 capsule
   • B.4 capsules
   • C.3 capsules
   • D.2 capsules

   Rationale: Divide the prescribed dose, 500 mg, by the amount in each capsule, 250 mg, to obtain 2 capsules. One capsule supplies only 250 mg, while 3 or 4 capsules exceed the prescribed dose. Match the units before calculating and verify that the result is reasonable.

2. 2.The provider prescribes 1,000 mL of IV fluid to infuse over 8 hours. What rate should the nurse program in mL/hr?

   • A.125 mL/hr
   • B.100 mL/hr
   • C.115 mL/hr
   • D.150 mL/hr

   Rationale: Divide the total volume, 1,000 mL, by 8 hours to obtain 125 mL/hr. A rate of 100 mL/hr would deliver only 800 mL in 8 hours, and 115 or 150 mL/hr would not match the order. Use the ordered volume and duration to calculate the pump rate.

3. 3.The provider prescribes 750 mg of a medication. After reconstitution, the vial contains 250 mg/mL. How many milliliters should the nurse withdraw?

   • A.1 mL
   • B.2 mL
   • C.3 mL
   • D.4 mL

   Rationale: Divide 750 mg by 250 mg/mL to calculate a volume of 3 mL. Withdrawing 1 or 2 mL would provide an incomplete dose, whereas 4 mL would provide 1,000 mg. Confirm the final concentration after reconstitution before calculating the volume.

4. 4.A medication order reads 0.25 mg PO. Available tablets contain 125 mcg each. How many tablets should the nurse administer?

   • A.3 tablets
   • B.2 tablets
   • C.1 tablet
   • D.4 tablets

   Answer and rationale are in the full material.

5. 5.The provider prescribes 0.4 mg of a medication by injection. The vial contains 0.2 mg/mL. What volume should the nurse prepare?

   • A.4 mL
   • B.0.5 mL
   • C.2 mL
   • D.1 mL

   Answer and rationale are in the full material.