NCLEX: Drug Dosage Calculation Exam 2

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1. Your patient needs 12,000 units of heparinSC. You have on hand 5000 units/mL. How much will you inject?

  1. 2.4 mL
  2. 2.5 mL
  3. 2.6 mL
  4. 2.7 mL

2. You have on hand atropine 0.4 mg/mL. You need to administer atropine gr 1/150 IM. How many milliliters will you prepare?

  1. 0.5 mL
  2. 1 mL
  3. 1.5 mL
  4. 2 mL

3. The physician orders meperidine 75 mg IM every 4 to 6 hours prn for a patient admitted with acute cholecystitis. You have on hand meperidine 50 mg/mL. How much will you give?

  1. 1 mL
  2. 1.5 mL
  3. 1.6 mL
  4. 2 mL

4.A patient is receiving 60 mg of methylprednisolone IM every 8 hours. You have on hand 75 mg/mL. How much will you draw up?

  1. 0.6 mL
  2. 0.7 mL
  3. 0.8 mL
  4. 2 mL

5. The physician orders an IV with heparin at 700 units/hour. You have a bag with 100 units/mL of solution. How many milliliters per hour will you set on the infusion controller?

  1. 7 mL/hour
  2. 8 mL/hour
  3. 9 mL/hour
  4. 10 mL/hour

6. You have an IVPB of ranitidine (Zantac) 50 mg in 50 mL D5W to run over 30 minutes. The tub- ing has a drip factor of 15. How many drops per minute will you set on the IV infusion controller?

  1. 22 gtts/minute
  2. 23 gtts/minute
  3. 24 gtts/minute
  4. 25 gtts/minute

7. Your patient has a headache but has difficulty swallowing pills. The physician orders acetamino- phen 1000 mg PO every 4 to 6 hours prn. You have acetaminophen elixir 160 mg in 5 mL. How much will you administer?

  1. 31 mL
  2. 31.25 mL
  3. 31.50 mL
  4. 32 mL

8. A patient with heart failure is on a 1000 mL fluid restriction each 24 hours. During the 7 a.m to 7 p.m. shift he has three meals, consuming 1/2 cup of coffee with each. He also has 50 mL of water each time he takes his medications at 7 a.m., noon, and 5 p.m. Midafternoon, he drinks 240 mL of soda. How many milliliters may he consume during the 7 p.m. to 7 a.m. shift?

  1. He can drink 120 mL during the night shift
  2. He can drink 250 mL during the night shift.
  3. He can drink 200 mL during the night shift.
  4. He can drink 350 mL during the night shift.

9. You are providing home care for a patient who needs to mix her oral potassium supplement with 120 mL of water or juice. She has only standard measuring cups in the house. How do you instruct her to take her dose?

  1. 1/2 cup
  2. 1/4 cup
  3. 2/3 cup
  4. 1 cup

10. A patient is admitted to the emergency room with a fractured leg. The physician orders mor- phine 15 mg IM stat. You have on hand morphine 10 mg/mL. How many milliliters will you administer?

  1. 3 mL
  2. 2 mL
  3. 1 mL
  4. 1.5 mL
Answers and Rationales
  1. Answer: A. 2.4 mL. (12,000 units x 1 mL) / 5,000 units = 2.4 mL
  2. Answer: B. 1 mL.  [(1/150) gr x 60 mg x 1 mL] / (1 gr x 0.4 mg) = 1 mL
  3. Answer: B. 1.5 mL.  (75 mg x 1 mL) / 50 mg = 1.5 mL
  4. Answer: C. 0.8 mL.  (60 mg x 1 mL) / 75 mg0.8 mL
  5. Answer: A. 7 mL/hour. (700 units x 1 mL) / (1 hour x 100 units) =  7 mL/hour
  6. Answer: D. 25 gtts/minute. (5o mL x 15 gtts) / (30 minutes x mL) = 25 gtts/ minute
  7. Answer: B. 31.25 mL. (1000 mg x 5 mL) / 160 mg=  31.25 mL
  8. Answer: B.He can drink 250 mL during the night shift. [(1/2 )cup x 240 mL] / 1 cup = 120 mL coffee
    • 120 ?+ 120 +? 120 ?+ 50 +? 50 +? 50 ?+ 240 ? = 750
    • 1000 mL – 750 mL ? 250 mL. He can drink 250 mL during the night shift.
  9. Answer: A. 1/2 cup. (120 mL x 1 cup) / 240 mL = 1/2 cup
  10. Answer D. 1.5 mL. (15 mg x 1 mL) / 10 mg = 1.5 mL
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