Pharmacology is one of the highest-yield and most challenging areas on the NCLEX, and steady practice is the best way to build confidence.
This free timed practice test includes 10 NCLEX pharmacology questions with answers and rationales covering safe medication administration, adverse effects, drug interactions, and patient teaching — the exact skills the exam tests most.
Each question gives you 2 minutes on a built-in timer to simulate exam pacing. Read the scenario, choose your answer, then review the rationale to understand not just the correct choice but the nursing reasoning behind it.
When you finish, use the links at the end to continue with more pharmacology, dosage calculation, and NCLEX practice questions on NurseStudy.net.
All 10 Questions With Answers & Rationales
Prefer to review at your own pace? Every question from the timed quiz above is listed here in full. Read each one, then tap Show Answer & Rationale to check your reasoning.
Question 1: Pharmacology
A client with chronic heart failure is prescribed IV furosemide. Before administering the medication, which assessment finding requires the nurse to contact the primary health care provider before giving the dose?
- A. Blood pressure 140/80 and heart rate 88
- B. Potassium 3.0 mEq/L and complaints of muscle weakness
- C. Mild pedal edema and crackles in bilateral lung bases
- D. Recent weight loss of 1.4 kg over 3 days
Show Answer & Rationale
Answer: B. Potassium 3.0 mEq/L and complaints of muscle weakness
Rationale: Furosemide can worsen hypokalemia and increase the risk of dysrhythmias; potassium 3.0 mEq/L is critically low, so the nurse must recognize a contraindication and notify the provider before administration.
Question 2: Pharmacology
A client with sepsis is receiving a continuous IV infusion of norepinephrine via a central venous catheter. The nurse notes the blood pressure has increased from 90/50 to 156/94 and the client now reports chest pain and headache. What is the nurse’s priority action?
- A. Increase the IV fluid rate to improve tissue perfusion
- B. Titrate the norepinephrine down per ordered parameters
- C. Flush the central line and continue the infusion
- D. Administer prescribed acetaminophen for headache
Show Answer & Rationale
Answer: B. Titrate the norepinephrine down per ordered parameters
Rationale: The nurse titrates vasoactive medications based on assessment data; a sharp rise in blood pressure and new chest pain indicate excessive vasoconstriction, so the infusion should be decreased per protocol while the provider is notified.
Question 3: Pharmacology
An older adult with community-acquired pneumonia is prescribed IV vancomycin. Which nursing action is most important before initiating the infusion?
- A. Reviewing the client’s most recent serum creatinine and BUN
- B. Measuring the client’s abdominal girth at the level of the umbilicus
- C. Asking the client about any history of tinnitus only
- D. Encouraging oral fluids to at least 3 liters daily
Show Answer & Rationale
Answer: A. Reviewing the client’s most recent serum creatinine and BUN
Rationale: The nurse must review pertinent data (labs, renal function) before administering high-risk medications; vancomycin is nephrotoxic, so baseline kidney function guides dosing and safe administration.
Question 4: Pharmacology
A client with type 1 diabetes uses a basal-bolus insulin regimen. The client’s blood glucose is 82 mg/dL just before the evening meal. The provider’s orders include: Glargine 20 units subcutaneously at 2100; Lispro 1 unit per 10 g carbohydrate with evening meal; Hold rapid-acting insulin if glucose less than 80 mg/dL. The client reports they plan to eat 60 g of carbohydrate. What dose of lispro should the nurse administer?
- A. 0 units
- B. 4 units
- C. 6 units
- D. 8 units
Show Answer & Rationale
Answer: C. 6 units
Rationale: The nurse performs dosage calculations and uses clinical judgment; with a blood glucose of 82 mg/dL (above 80), and 1 unit per 10 g for 60 g, the client should receive 6 units of lispro.
Question 5: Pharmacology
The nurse is preparing to administer the first dose of IV ceftriaxone to a client with pyelonephritis. Which statement by the client requires the nurse to verify the prescription with the primary health care provider before administration?
- A. “I had a rash when I took amoxicillin a few years ago.”
- B. “I sometimes feel nauseated with strong pain medicine.”
- C. “I take a multivitamin every morning with breakfast.”
- D. “I had my gallbladder removed last year.”
Show Answer & Rationale
Answer: A. “I had a rash when I took amoxicillin a few years ago.”
Rationale: The nurse must review allergies and potential interactions prior to medication administration; a prior reaction to a penicillin antibiotic may indicate cross-sensitivity to cephalosporins, so the prescription must be clarified.
Question 6: Pharmacology
A client with acute pulmonary embolism is receiving a continuous IV heparin infusion. The most recent lab values are: aPTT 115 seconds (goal 60–80 seconds); Platelets 140,000/mm³; Hemoglobin 12.2 g/dL. Which nursing action is the priority?
- A. Continue the infusion and recheck aPTT in 6 hours
- B. Stop the heparin infusion and notify the primary health care provider
- C. Administer prescribed oral warfarin concurrently
- D. Increase the infusion rate per protocol to reach therapeutic range
Show Answer & Rationale
Answer: B. Stop the heparin infusion and notify the primary health care provider
Rationale: The nurse must monitor lab results and handle high-risk medications safely; an aPTT significantly above therapeutic range increases bleeding risk, so the infusion should be stopped and the provider notified for dose adjustment.
Question 7: Pharmacology
The nurse is teaching a client with newly diagnosed hypertension about oral lisinopril therapy. Which client statement indicates the need for further teaching?
- A. “I will change positions slowly so I do not get dizzy.”
- B. “I will avoid using salt substitutes that contain potassium.”
- C. “I will stop the medication if I develop a dry cough and wait to see if it goes away.”
- D. “I will check my blood pressure at home and keep a record for my clinic visits.”
Show Answer & Rationale
Answer: C. “I will stop the medication if I develop a dry cough and wait to see if it goes away.”
Rationale: The nurse educates about side effects and when to notify the provider; a persistent dry cough can be an adverse effect of ACE inhibitors, and the client should contact the provider rather than independently stopping the drug and waiting.
Question 8: Pharmacology
A postoperative client with a history of obstructive sleep apnea is receiving IV morphine via patient-controlled analgesia (PCA). Which assessment requires immediate nursing intervention?
- A. Respiratory rate of 8 breaths/min and oxygen saturation of 88%
- B. Reported pain level of 7 out of 10 after using the PCA button
- C. Mild pruritus at the IV site without redness or swelling
- D. Drowsiness but ability to awaken to verbal stimuli
Show Answer & Rationale
Answer: A. Respiratory rate of 8 breaths/min and oxygen saturation of 88%
Rationale: When administering medications for pain management, the nurse must monitor for adverse effects; respiratory depression and hypoxia represent a high-risk complication of opioids and require rapid intervention, including stopping the PCA and supporting respirations.
Question 9: Pharmacology
The nurse is caring for a client receiving total parenteral nutrition (TPN) via a central venous catheter. Which finding requires the nurse’s priority action?
- A. Capillary blood glucose 212 mg/dL without symptoms
- B. Temperature 38.5°C and chills during the infusion
- C. Mild weight gain of 0.5 kg over 3 days
- D. Trace bilateral ankle edema at the end of the shift
Show Answer & Rationale
Answer: B. Temperature 38.5°C and chills during the infusion
Rationale: The nurse must recognize complications of parenteral nutrition and intervene; fever and chills in a client receiving TPN suggest catheter-related bloodstream infection, a serious complication needing immediate evaluation and possible culture and antibiotic therapy.
Question 10: Pharmacology
A client admitted with acute decompensated heart failure is receiving a continuous IV infusion of nitroglycerin. The client’s blood pressure has decreased from 128/76 to 86/50 within 15 minutes, and the client reports feeling light-headed. What is the nurse’s best action?
- A. Stop the infusion and notify the primary health care provider immediately
- B. Elevate the head of the bed and continue the infusion at the same rate
- C. Administer prescribed IV furosemide to reduce fluid volume
- D. Reassure the client that this is an expected effect and recheck in 30 minutes
Show Answer & Rationale
Answer: A. Stop the infusion and notify the primary health care provider immediately
Rationale: The nurse titrates medications based on assessment and uses precautions to prevent complications; symptomatic hypotension indicates that nitroglycerin is causing excessive vasodilation, so the infusion should be stopped and the provider notified for further orders.
NCLEX Pharmacology Practice Tests
Sharpen your medication knowledge with 50 free, timed pharmacology questions — complete with answers and detailed rationales. Work through all five tests to cover the drug classes the NCLEX tests most.
Core Adult Pharmacology
Safe medication administration, adverse effects, and patient teaching basics.
High-Alert Medications
Anticoagulants, insulin, antiepileptics, opioids, and patient safety.
Pediatric, Oncology & OB
Chemotherapy agents, Rh immune globulin, oxytocin, and weight-based dosing.
Pediatric Meds & Controlled Substances
Insulin teaching, digoxin, vancomycin troughs, and safe controlled-substance handling.
Maternity & OB Pharmacology
Magnesium sulfate, epidurals, nifedipine, nalbuphine, and postpartum medications.
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