Introduction
Pharmacological therapies constitute a critical component of the NCLEX-PN examination, representing 10-17% of the total test content within the Physiological Integrity category, which encompasses 43-67% of the entire exam. This high-yield area focuses on the licensed practical nurse’s essential role in safe medication administration, accurate dosage calculations, and vigilant monitoring for therapeutic and adverse effects. Licensed practical nurses must demonstrate competency in the five rights of medication administration: right patient, right medication, right dose, right route, and right time, while also understanding the importance of documentation and patient education. The complexity of modern pharmacotherapy requires LPNs to possess foundational knowledge of drug classifications, common side effects, contraindications, and basic pharmacokinetic principles that affect medication action and duration. Safe medication practices demand understanding of proper storage, preparation, and administration techniques across various routes including oral, topical, intramuscular, and subcutaneous methods. LPNs must be proficient in recognizing signs of medication errors, adverse drug reactions, and drug interactions that could compromise patient safety. Additionally, the role requires competency in basic dosage calculations, unit conversions, and the ability to verify dosages using dimensional analysis or ratio-proportion methods. Patient education regarding medication compliance, side effect recognition, and proper self-administration techniques represents another crucial aspect of pharmaceutical care that LPNs provide daily. Understanding age-specific considerations for pediatric and geriatric populations, including dose adjustments and route modifications, is essential for safe practice across the lifespan. The NCLEX-PN examination emphasizes practical application scenarios that reflect real-world clinical situations, requiring candidates to demonstrate sound clinical judgment in medication-related decisions. This practice question set addresses the most frequently tested concepts in pharmacological therapies, emphasizing the critical thinking and safety principles that are fundamental to successful LPN practice and exam success.
Practice Questions
Question 1:
The LPN is preparing to administer digoxin 0.25 mg PO to a client. Before administration, which vital sign must be assessed?
A) Blood pressure
B) Respiratory rate
C) Temperature
D) Heart rate
Correct Answer: D) Heart rate
Explanation: Digoxin is a cardiac glycoside that slows heart rate. The apical heart rate should be assessed for one full minute before administration. If the heart rate is below 60 bpm in adults, the medication should be held and the physician notified. This is a fundamental safety measure to prevent bradycardia and cardiac complications.
Question 2:
A client is receiving heparin 5,000 units subcutaneously every 8 hours. Which laboratory value should the LPN monitor most closely?
A) Hemoglobin and hematocrit
B) Partial thromboplastin time (PTT)
C) Platelet count
D) White blood cell count
Correct Answer: B) Partial thromboplastin time (PTT)
Explanation: PTT measures the effectiveness of heparin therapy. Therapeutic range is typically 1.5-2.5 times the control value. Monitoring PTT helps prevent bleeding complications from over-anticoagulation and ensures therapeutic effectiveness.
Question 3:
An elderly client with diabetes is prescribed sliding scale insulin. The blood glucose is 245 mg/dL. According to the sliding scale, 4 units of regular insulin should be given. Where is the most appropriate injection site?
A) Deltoid muscle
B) Ventrogluteal muscle
C) Abdomen, 2 inches from umbilicus
D) Anterior thigh
Correct Answer: C) Abdomen, 2 inches from umbilicus
Explanation: The abdomen provides the most consistent and rapid absorption for insulin. Sites should be rotated within the abdomen, avoiding areas within 2 inches of the umbilicus, scars, or lipodystrophy. The abdomen has less variation in absorption rates compared to arms or thighs.
Question 4:
A client is taking warfarin 5 mg daily. The client asks what foods should be limited. Which response by the LPN is most appropriate?
A) “Avoid all dairy products while taking this medication”
B) “Limit foods high in vitamin K like green leafy vegetables”
C) “You can eat anything you want, just take the medication with food”
D) “Avoid citrus fruits and tomatoes”
Correct Answer: B) “Limit foods high in vitamin K like green leafy vegetables”
Explanation: Vitamin K interferes with warfarin’s anticoagulant effect. Foods high in vitamin K include green leafy vegetables (spinach, kale, lettuce), broccoli, and Brussels sprouts. Consistent intake is more important than complete avoidance – clients should maintain consistent dietary patterns.
Question 5:
The LPN is administering eye drops to a client. What is the correct technique?
A) Apply drops directly onto the cornea
B) Pull down the lower eyelid and apply drops into the conjunctival sac
C) Apply drops to the inner corner of the eye
D) Have the client squeeze eyes tightly shut after administration
Correct Answer: B) Pull down the lower eyelid and apply drops into the conjunctival sac
Explanation: The lower conjunctival sac provides proper placement for eye medications. This technique avoids corneal damage, ensures medication retention, and promotes absorption. The client should gently close eyes and avoid squeezing to prevent medication loss.
Question 6:
A client is prescribed amoxicillin 500 mg PO TID for 10 days. After 3 days, the client reports feeling much better and asks if they can stop the antibiotic. What should the LPN tell the client?
A) “Yes, if you feel better, you can stop the medication”
B) “You must complete the full 10-day course of antibiotics”
C) “Take the medication only when you have symptoms”
D) “Skip doses if you feel well, but keep the medication for later use”
Correct Answer: B) “You must complete the full 10-day course of antibiotics”
Explanation: Completing the full antibiotic course is essential to prevent antibiotic resistance and ensure complete eradication of infection. Stopping antibiotics early can lead to recurrent infection and development of resistant bacteria.
Question 7:
A client is prescribed furosemide (Lasix) 40 mg PO daily. Which electrolyte imbalance should the LPN monitor for?
A) Hypernatremia
B) Hyperkalemia
C) Hypokalemia
D) Hypercalcemia
Correct Answer: C) Hypokalemia
Explanation: Furosemide is a loop diuretic that causes potassium loss through increased urinary excretion. Hypokalemia can lead to dangerous cardiac arrhythmias, muscle weakness, and cramping. Potassium levels should be monitored regularly, and supplementation may be necessary.
Question 8:
The physician orders morphine 8 mg IM q4h PRN for severe pain. The available medication is morphine 10 mg/mL. How many mL should the LPN administer?
A) 0.6 mL
B) 0.8 mL
C) 1.0 mL
D) 1.25 mL
Correct Answer: B) 0.8 mL
Explanation: Using the formula: Desired dose ÷ Available dose × Quantity = 8 mg ÷ 10 mg × 1 mL = 0.8 mL. Always double-check calculations and have another nurse verify narcotic calculations before administration.
Question 9:
A client taking phenytoin (Dilantin) for seizures develops gingival hyperplasia. What should the LPN include in patient education?
A) “This is a serious allergic reaction; stop the medication immediately”
B) “Increase your fluid intake to reduce this side effect”
C) “Good oral hygiene and regular dental care can help manage this condition”
D) “This means the medication isn’t working properly”
Correct Answer: C) “Good oral hygiene and regular dental care can help manage this condition”
Explanation: Gingival hyperplasia is a common side effect of phenytoin, not an allergic reaction. Good oral hygiene, regular brushing, flossing, and dental visits can help manage this condition. The medication should not be stopped without physician consultation.
Question 10:
A client is prescribed nitroglycerin sublingual tablets for chest pain. What instruction should the LPN provide?
A) “Swallow the tablet with water”
B) “Place the tablet under your tongue and let it dissolve”
C) “Chew the tablet thoroughly before swallowing”
D) “Take the tablet with food to prevent stomach upset”
Correct Answer: B) “Place the tablet under your tongue and let it dissolve”
Explanation: Sublingual nitroglycerin is absorbed through mucous membranes under the tongue for rapid onset. It should not be chewed, swallowed, or taken with liquids. The client should sit or lie down due to potential hypotension and dizziness.
Question 11:
An older adult client is prescribed multiple medications. To prevent medication errors, what should the LPN emphasize during discharge teaching?
A) “Take all medications at the same time each day”
B) “Use a pill organizer and maintain an updated medication list”
C) “Only take medications when you feel symptoms”
D) “Ask family members to manage all your medications”
Correct Answer: B) “Use a pill organizer and maintain an updated medication list”
Explanation: Pill organizers help prevent missed doses and accidental double-dosing. An updated medication list should be carried to all healthcare appointments. This promotes medication safety and adherence, especially important for older adults managing multiple medications.
Question 12:
A client receiving IV antibiotics develops redness, swelling, and pain at the IV site. What is the LPN’s priority action?
A) Apply warm compresses to the site
B) Slow the IV infusion rate
C) Stop the IV infusion immediately
D) Notify the physician
Correct Answer: C) Stop the IV infusion immediately
Explanation: These symptoms indicate phlebitis or infiltration. The IV must be stopped immediately to prevent further tissue damage. After stopping the infusion, assess the site, apply appropriate interventions (warm or cold compress depending on the cause), document, and notify the physician.
Question 13:
A client with hypertension is prescribed lisinopril. Which side effect should the LPN teach the client to report immediately?
A) Headache
B) Dizziness when standing
C) Persistent dry cough
D) Fatigue
Correct Answer: C) Persistent dry cough
Explanation: A persistent dry cough is a common side effect of ACE inhibitors like lisinopril and may indicate the need to switch to an ARB. While other symptoms may occur, the persistent cough is distinctive to ACE inhibitors and should be reported for potential medication adjustment.
Question 14:
The LPN is preparing to administer insulin to a diabetic client. The nurse draws up 10 units of regular insulin and 15 units of NPH insulin. What is the correct procedure?
A) Draw up NPH first, then regular insulin
B) Draw up regular insulin first, then NPH insulin
C) Use separate syringes for each type of insulin
D) Mix the insulins in any order
Correct Answer: B) Draw up regular insulin first, then NPH insulin
Explanation: Regular (clear) insulin should be drawn up first, followed by NPH (cloudy) insulin. This prevents contamination of the regular insulin with NPH. The mnemonic “clear before cloudy” helps remember this important safety principle.
Question 15:
A client is prescribed prednisone 40 mg PO daily for an inflammatory condition. After several weeks of therapy, which instruction is most important?
A) “Take the medication with food to prevent stomach upset”
B) “Monitor your blood sugar levels regularly”
C) “Do not stop this medication suddenly without consulting your doctor”
D) “Increase your intake of calcium and vitamin D”
Correct Answer: C) “Do not stop this medication suddenly without consulting your doctor”
Explanation: Corticosteroids like prednisone suppress the adrenal glands. Sudden discontinuation can cause adrenal crisis, a life-threatening condition. Tapering is required to allow the adrenal glands to resume normal function. While other instructions are important, preventing adrenal crisis is the priority.
These practice questions focus on essential pharmacological concepts that LPNs encounter daily and are frequently tested on the NCLEX-PN examination. Understanding medication safety principles, proper administration techniques, and monitoring requirements is crucial for safe nursing practice.