Introduction
Pharmacology represents one of the most challenging and critical content areas on the HESI Exit Exam, requiring nursing students to demonstrate comprehensive knowledge of medications, their mechanisms of action, therapeutic effects, adverse reactions, and safe administration practices. Success in this domain is essential not only for passing the HESI exam but also for ensuring patient safety in clinical practice, where medication errors remain a leading cause of preventable harm. From understanding drug classifications and pharmacokinetics to recognizing dangerous drug interactions and managing toxicity, nurses must possess a thorough command of pharmacological principles that span all body systems and patient populations. The HESI Exit Exam tests your ability to apply pharmacology knowledge in realistic clinical scenarios, requiring you to prioritize nursing actions, identify critical assessment findings, and make sound clinical judgments about medication administration. This practice question set focuses on high-yield medications that frequently appear on the HESI exam, including cardiovascular drugs, respiratory medications, endocrine agents, anticoagulants, opioids, antibiotics, and emergency medications. Each question is designed to mirror the critical thinking level expected on the HESI exam, moving beyond simple recall to test your understanding of therapeutic ranges, antidotes, contraindications, and patient education priorities. By working through these pharmacology scenarios, you’ll strengthen your ability to recognize medication-related complications, understand the rationale behind nursing interventions, and develop the clinical judgment skills necessary for safe medication administration. Whether you’re preparing for your HESI Exit Exam or seeking to enhance your pharmacology knowledge for NCLEX preparation, these practice questions will help you build confidence in managing the complex medication regimens you’ll encounter in professional nursing practice. Use the detailed explanations to deepen your understanding of drug mechanisms, reinforce key nursing considerations, and identify patterns in how pharmacology questions are constructed and answered on standardized nursing examinations.
Practice Questions
HESI PHARMACOLOGY – 15 PRACTICE QUESTIONS
1. A patient is receiving morphine sulfate 4 mg IV every 4 hours for post-operative pain. Which assessment finding requires immediate intervention?
A) Respiratory rate of 8 breaths per minute
B) Pain level of 3/10
C) Blood pressure of 118/76 mmHg
D) Heart rate of 72 beats per minute
CORRECT ANSWER: A) Respiratory rate of 8 breaths per minute
EXPLANATION: Morphine is an opioid analgesic that can cause respiratory depression, a potentially life-threatening adverse effect. A respiratory rate below 12 breaths per minute indicates significant respiratory depression and requires immediate intervention. The nurse should hold the medication, stimulate the patient, and prepare to administer naloxone (Narcan), the opioid antagonist. Continuous monitoring of respiratory status is essential for all patients receiving opioid medications.
2. A patient taking warfarin (Coumadin) has an INR of 5.2. Which action should the nurse anticipate?
A) Administer vitamin K
B) Increase the warfarin dose
C) Continue current warfarin dose
D) Administer protamine sulfate
CORRECT ANSWER: A) Administer vitamin K
EXPLANATION: The therapeutic INR range for most patients on warfarin is 2.0-3.0 (or 2.5-3.5 for mechanical heart valves). An INR of 5.2 indicates excessive anticoagulation and increased bleeding risk. Vitamin K is the antidote for warfarin toxicity and will be administered to reverse the anticoagulant effect. The nurse should also assess for signs of bleeding and hold the warfarin dose. Protamine sulfate is the antidote for heparin, not warfarin.
3. A patient with type 2 diabetes is prescribed glimepiride (Amaryl). Which instruction is most important for the nurse to provide?
A) “Take this medication at bedtime.”
B) “Monitor for signs of hypoglycemia such as shakiness and sweating.”
C) “This medication will replace the need for diet and exercise.”
D) “You can skip doses if your blood sugar is normal.”
CORRECT ANSWER: B) “Monitor for signs of hypoglycemia such as shakiness and sweating.”
EXPLANATION: Glimepiride is a sulfonylurea that stimulates insulin release from the pancreas, which can cause hypoglycemia, especially if meals are skipped or delayed. Patients must be educated to recognize hypoglycemia symptoms (shakiness, sweating, confusion, tachycardia, hunger) and treat promptly with 15 grams of fast-acting carbohydrates. The medication should be taken with breakfast or the first main meal, not at bedtime. Diet and exercise remain essential components of diabetes management.
4. A patient is prescribed levothyroxine (Synthroid) 100 mcg daily for hypothyroidism. When should the nurse instruct the patient to take this medication?
A) With breakfast
B) At bedtime with a snack
C) On an empty stomach, 30-60 minutes before breakfast
D) With lunch
CORRECT ANSWER: C) On an empty stomach, 30-60 minutes before breakfast
EXPLANATION: Levothyroxine should be taken on an empty stomach, 30-60 minutes before breakfast, to maximize absorption. Food, especially high-fiber foods, calcium, and iron supplements can interfere with absorption. The medication should be taken at the same time each day for consistent therapeutic effect. Patients should avoid taking it with coffee, as caffeine can also affect absorption.
5. A patient receiving phenytoin (Dilantin) for seizure control has a serum level of 25 mcg/mL. Which assessment finding would the nurse expect?
A) Seizure activity
B) Nystagmus and ataxia
C) Hypotension
D) Bradycardia
CORRECT ANSWER: B) Nystagmus and ataxia
EXPLANATION: The therapeutic range for phenytoin is 10-20 mcg/mL. A level of 25 mcg/mL indicates toxicity. Signs of phenytoin toxicity include nystagmus (involuntary eye movements), ataxia (loss of coordination), slurred speech, confusion, and drowsiness. The nurse should hold the next dose, notify the healthcare provider, and continue to monitor for worsening symptoms. Chronic phenytoin use can also cause gingival hyperplasia and hirsutism.
6. A patient is prescribed albuterol (Proventil) inhaler for asthma. Which side effect should the nurse teach the patient to expect?
A) Bradycardia
B) Drowsiness
C) Tachycardia and tremors
D) Constipation
CORRECT ANSWER: C) Tachycardia and tremors
EXPLANATION: Albuterol is a beta-2 adrenergic agonist bronchodilator that can cause sympathetic nervous system stimulation, resulting in tachycardia, tremors, nervousness, and palpitations. These side effects are usually mild and transient. Patients should be instructed to report severe or persistent tachycardia. The medication provides rapid relief of bronchospasm and is used as a rescue inhaler for acute asthma symptoms.
7. A patient taking furosemide (Lasix) 40 mg daily should be monitored for which electrolyte imbalance?
A) Hyperkalemia
B) Hypokalemia
C) Hypernatremia
D) Hypercalcemia
CORRECT ANSWER: B) Hypokalemia
EXPLANATION: Furosemide is a loop diuretic that causes potassium loss through the kidneys, leading to hypokalemia. Low potassium levels increase the risk of cardiac arrhythmias, muscle weakness, and cramping. Patients should be monitored with regular serum potassium levels and may require potassium supplementation or dietary increases in potassium-rich foods (bananas, oranges, potatoes, spinach). Signs of hypokalemia include muscle weakness, fatigue, constipation, and cardiac dysrhythmias.
8. A patient with a severe penicillin allergy is prescribed cephalexin (Keflex). What is the nurse’s priority action?
A) Administer the medication as ordered
B) Question the order due to potential cross-sensitivity
C) Give the medication with food to reduce allergic reaction
D) Administer an antihistamine before giving the antibiotic
CORRECT ANSWER: B) Question the order due to potential cross-sensitivity
EXPLANATION: Cephalosporins have a structural similarity to penicillins, and there is a risk of cross-sensitivity, particularly in patients with a history of severe anaphylactic reactions to penicillin. The nurse should question the order and clarify with the prescriber before administering. If the patient had only a mild rash with penicillin, cephalosporins may be used cautiously, but severe reactions (anaphylaxis, angioedema) are contraindications.
9. A patient is prescribed nitroglycerin sublingual tablets for angina. Which instruction is most important?
A) “Swallow the tablet whole with water.”
B) “Take up to 3 tablets, 5 minutes apart, and call 911 if pain persists.”
C) “Store the medication in the bathroom medicine cabinet.”
D) “Take one tablet daily to prevent chest pain.”
CORRECT ANSWER: B) “Take up to 3 tablets, 5 minutes apart, and call 911 if pain persists.”
EXPLANATION: Sublingual nitroglycerin should be placed under the tongue at the first sign of angina. If pain is not relieved after one tablet, the patient should take a second tablet after 5 minutes, and a third tablet 5 minutes later if needed. If pain persists after 3 tablets, the patient should call 911, as this may indicate myocardial infarction. The medication should be stored in a dark, dry place (not the bathroom) and replaced every 6 months as it loses potency.
10. A patient taking St. John’s Wort reports starting a new prescription for sertraline (Zoloft). What is the nurse’s priority concern?
A) Increased risk of bleeding
B) Risk of serotonin syndrome
C) Decreased effectiveness of sertraline
D) Increased sedation
CORRECT ANSWER: B) Risk of serotonin syndrome
EXPLANATION: St. John’s Wort is an herbal supplement with antidepressant properties that can interact with SSRIs like sertraline, increasing the risk of serotonin syndrome. Serotonin syndrome is a potentially life-threatening condition characterized by agitation, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle rigidity, and hyperthermia. Patients should be instructed to avoid combining St. John’s Wort with prescription antidepressants and to report any concerning symptoms immediately.
11. A patient is prescribed insulin glargine (Lantus) 20 units subcutaneously at bedtime. Which statement about this medication is correct?
A) It has a peak action time of 2-4 hours
B) It should be mixed with regular insulin in the same syringe
C) It provides 24-hour basal insulin coverage with no pronounced peak
D) It is used to cover mealtime glucose spikes
CORRECT ANSWER: C) It provides 24-hour basal insulin coverage with no pronounced peak
EXPLANATION: Insulin glargine (Lantus) is a long-acting basal insulin that provides steady insulin levels for approximately 24 hours without a pronounced peak. This makes it ideal for maintaining baseline glucose control. It should NOT be mixed with other insulins in the same syringe, as this can alter its pharmacokinetic properties. Rapid-acting insulins (lispro, aspart, glulisine) are used to cover mealtime glucose spikes.
12. A patient receiving heparin infusion has an aPTT of 110 seconds (control 30 seconds). What action should the nurse take?
A) Continue the current infusion rate
B) Increase the infusion rate
C) Decrease the infusion rate
D) Discontinue the infusion and administer protamine sulfate
CORRECT ANSWER: C) Decrease the infusion rate
EXPLANATION: The therapeutic aPTT range for heparin therapy is typically 1.5-2.5 times the control value (45-75 seconds for a control of 30 seconds). An aPTT of 110 seconds indicates excessive anticoagulation, requiring a decrease in the infusion rate. The nurse should follow facility protocol, notify the provider, and assess for signs of bleeding. Protamine sulfate is reserved for severe bleeding or heparin overdose requiring complete reversal.
13. A patient with heart failure is prescribed digoxin 0.25 mg daily. Before administering the medication, the nurse notes the patient’s apical pulse is 54 bpm. What is the appropriate action?
A) Administer the medication as ordered
B) Hold the medication and notify the healthcare provider
C) Give half the dose
D) Administer the medication with food
CORRECT ANSWER: B) Hold the medication and notify the healthcare provider
EXPLANATION: Digoxin should be held if the apical pulse is less than 60 bpm in adults (or per facility protocol), as it can cause further bradycardia and heart block. The nurse should assess for other signs of digoxin toxicity (nausea, vomiting, visual disturbances, confusion) and check the digoxin level if ordered. The healthcare provider should be notified before administering the dose.
14. A patient is prescribed sucralfate (Carafate) for peptic ulcer disease. When should this medication be administered?
A) With meals
B) At bedtime only
C) 1 hour before meals and at bedtime
D) Immediately after meals
CORRECT ANSWER: C) 1 hour before meals and at bedtime
EXPLANATION: Sucralfate works by forming a protective barrier over ulcerated tissue in the stomach. For maximum effectiveness, it should be taken on an empty stomach, 1 hour before meals and at bedtime. Food can interfere with its ability to coat the ulcer. The medication should not be taken within 2 hours of antacids, as they can reduce its effectiveness. Patients should be advised that it may cause constipation.
15. A patient taking sodium polystyrene sulfonate (Kayexalate) should be monitored for which therapeutic effect?
A) Decreased blood glucose
B) Decreased serum potassium
C) Increased blood pressure
D) Increased serum calcium
CORRECT ANSWER: B) Decreased serum potassium
EXPLANATION: Sodium polystyrene sulfonate (Kayexalate) is a potassium-binding resin used to treat hyperkalemia. It works by exchanging sodium for potassium in the intestines, promoting potassium excretion in the stool. The nurse should monitor serum potassium levels to ensure they decrease to a safe range (3.5-5.0 mEq/L) and assess for signs of hypokalemia if levels drop too low. The medication can cause constipation, so a laxative is often given concurrently.
Study Tips for HESI Pharmacology
– Create drug cards organized by classification with key information: mechanism, indications, side effects, nursing considerations
– Focus on high-alert medications and their antidotes (opioids/naloxone, warfarin/vitamin K, heparin/protamine sulfate)
– Memorize therapeutic ranges for commonly monitored drugs (digoxin, phenytoin, theophylline, lithium)
– Understand drug interactions, especially with herbal supplements like St. John’s Wort
– Practice dosage calculations regularly to maintain proficiency
– Learn the “rights” of medication administration and apply them to practice scenarios
– Study medications by body system to understand related drugs together
– Pay special attention to patient education priorities for each medication class
Conclusion
Pharmacology mastery is essential for HESI Exit Exam success and safe nursing practice. These 15 practice questions cover critical medications and concepts that frequently appear on the exam, from anticoagulants and cardiac drugs to endocrine medications and antibiotics. Review the explanations thoroughly to understand not just the correct answers, but the clinical reasoning and nursing priorities behind each decision. Remember to focus on therapeutic ranges, adverse effects, antidotes, and patient teaching—these are consistently high-yield topics on the HESI exam. Good luck with your preparation!
Published: 2025-12-12
Exam: HESI Exit Exam
Topic: Pharmacology