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NCLEX Pharmacology Practice Questions

Pharmacology is the section most nursing students fear, and for good reason: it is roughly 12 to 18% of the NCLEX-RN test plan, and it rewards knowing what to monitor and what to hold, not memorising every drug.

The questions below cover the drug classes that come up again and again: cardiac glycosides, insulin, anticoagulants, diuretics and antibiotics. Each one has a rationale for every option, so you learn the reasoning, not just the letter.

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What the NCLEX tests in pharmacology

5 pharmacology practice questions with rationales

Answer each one before opening the rationale. Every option is explained, including the wrong ones.

Question 1 · Multiple choice
A nurse is preparing to give digoxin 0.25 mg PO to a client with heart failure. The apical pulse is 54 beats/min. What is the nurse's best action?
  1. Give the dose and recheck the pulse in one hour
  2. Hold the dose and notify the healthcare provider
  3. Give half the dose
  4. Give the dose with a glass of orange juice
Show answer and rationale

Answer: B

A. Giving the dose with a pulse under 60 risks worsening bradycardia.

B. Correct. Digoxin slows the heart rate; for an adult, hold it when the apical pulse is below 60 and notify the provider.

C. Nurses do not change a prescribed dose on their own.

D. Orange juice is unrelated to digoxin; potassium matters because low potassium raises toxicity risk, but it does not make this dose safe.

Question 2 · Select all that apply
A client taking warfarin asks about home safety. Which instructions should the nurse include? Select all that apply.
  1. Use an electric razor
  2. Keep vitamin K intake consistent from week to week
  3. Take aspirin for headaches
  4. Report dark, tarry stools
  5. Use a soft-bristled toothbrush
Show answer and rationale

Answer: A, B, D, E

A. Correct. An electric razor lowers the risk of cuts and bleeding.

B. Correct. Vitamin K reverses warfarin, so intake should be steady, not eliminated.

C. Aspirin adds antiplatelet effect and raises bleeding risk; acetaminophen is preferred.

D. Correct. Tarry stools can mean GI bleeding.

E. Correct. A soft toothbrush reduces gum bleeding.

Question 3 · Multiple choice
A client receiving a continuous heparin infusion has an aPTT far above the therapeutic range and is bleeding from the IV site. Which medication should the nurse anticipate?
  1. Vitamin K (phytonadione)
  2. Protamine sulfate
  3. Naloxone
  4. Flumazenil
Show answer and rationale

Answer: B

A. Vitamin K reverses warfarin, not heparin.

B. Correct. Protamine sulfate is the reversal agent for heparin.

C. Naloxone reverses opioids.

D. Flumazenil reverses benzodiazepines.

Question 4 · Multiple choice
A client receives regular insulin subcutaneously at 0730. When is the client at greatest risk of hypoglycemia?
  1. 0800 to 0830
  2. 0930 to 1230
  3. 1530 to 1730
  4. 2000 to 2200
Show answer and rationale

Answer: B

A. Regular insulin begins working in about 30 to 60 minutes; this is onset, not peak.

B. Correct. Regular insulin peaks about 2 to 4 hours after injection, so roughly 0930 to 1130 and into early afternoon.

C. By then regular insulin is waning.

D. Regular insulin's duration is about 6 to 8 hours; this is past it.

Question 5 · Select all that apply
A client is started on furosemide. Which findings should the nurse monitor for as adverse effects? Select all that apply.
  1. Hypokalemia
  2. Orthostatic hypotension
  3. Hyperkalemia
  4. Dehydration
  5. Ototoxicity with rapid IV doses
Show answer and rationale

Answer: A, B, D, E

A. Correct. Loop diuretics waste potassium.

B. Correct. Fluid loss can cause dizziness on standing.

C. Hyperkalemia is a risk of potassium-sparing diuretics like spironolactone, not furosemide.

D. Correct. Strong diuresis can cause fluid volume deficit.

E. Correct. High or rapid IV doses can damage hearing.

How to study pharmacology for the NCLEX

  1. Learn drugs by class and by what you check before giving them: pulse, BP, potassium, glucose, levels.
  2. Know the antidote pairs cold: heparin and protamine, warfarin and vitamin K, opioids and naloxone, benzodiazepines and flumazenil.
  3. For high-alert drugs, the safe answer usually involves a second check, holding the dose, or notifying the provider.
  4. Practise from your own pharm lecture slides, because your exam follows your instructor's drug list.

Frequently asked questions

How much pharmacology is on the NCLEX?

Pharmacological and parenteral therapies make up roughly 12 to 18% of the NCLEX-RN test plan, and medication questions also appear inside other categories like safety and physiological adaptation.

What is the best way to study pharmacology for NCLEX?

Study by drug class, focus on what to assess before giving, signs of toxicity and key teaching points, then drill practice questions with rationales until the patterns are automatic.

Can I make pharmacology questions from my own notes?

Yes. Upload your lecture slides or notes to NurseQuizAI and it writes NCLEX-style questions, including select-all-that-apply, from that exact material.

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