I85PREP
⌘ K
PEBC study materials
PEBC study resources

PEBC practice questions

One question at a time. Build your PEBC understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Pharmacist Qualifying Examination Part I (MCQ)

A patient with a documented penicillin anaphylaxis history requires treatment for a serious gram-negative infection. Which antimicrobial class is most appropriate to select, pending culture results?

  1. Carbapenems
  2. Penicillinase-resistant penicillins
  3. Cephalosporins
  4. Aminoglycosides Correct answer.

Explanation

Aminoglycosides are structurally unrelated to beta-lactams, so they carry no cross-reactivity risk in a patient with penicillin anaphylaxis. They provide reliable gram-negative coverage and are a rational empiric choice when beta-lactams must be avoided.

Question 2Pharmacist Qualifying Examination Part I (MCQ)

Which laboratory parameter is the most reliable early indicator of warfarin's anticoagulant effect when therapy is initiated?

  1. Activated partial thromboplastin time
  2. Thrombin time
  3. Bleeding time
  4. International normalized ratio Correct answer.

Explanation

Warfarin inhibits vitamin K–dependent clotting factors, and the INR reflects the extrinsic pathway where factor VII has the shortest half-life. The INR therefore rises earliest and is the standard monitoring parameter for warfarin dose titration.

Question 3Pharmacist Qualifying Examination Part I (MCQ)

A patient on a stable dose of levothyroxine reports new fatigue and weight gain. Which factor is most likely to reduce levothyroxine absorption?

  1. Taking the dose at bedtime
  2. Concurrent calcium carbonate Correct answer.
  3. Taking the dose with coffee
  4. Using brand-name product

Explanation

Calcium salts chelate levothyroxine in the gut and markedly reduce its bioavailability. Patients should separate calcium and iron from levothyroxine by at least four hours to preserve absorption.

Question 4Pharmacist Qualifying Examination Part I (MCQ)

Which statement best describes the mechanism by which metformin lowers blood glucose?

  1. It inhibits intestinal alpha-glucosidase.
  2. It reduces hepatic gluconeogenesis and improves insulin sensitivity. Correct answer.
  3. It stimulates pancreatic insulin secretion.
  4. It increases insulin sensitivity in peripheral muscle.

Explanation

Metformin's principal effect is suppression of hepatic glucose production, with a secondary contribution from improved peripheral insulin sensitivity. It does not stimulate insulin release, so it does not cause hypoglycemia when used alone.

Question 5Pharmacist Qualifying Examination Part I (MCQ)

A 70-year-old patient with reduced renal function is prescribed digoxin. Which electrolyte abnormality most increases the risk of digoxin toxicity?

  1. Hypochloremia
  2. Hypernatremia
  3. Hyperkalemia
  4. Hypokalemia Correct answer.

Explanation

Potassium and digoxin compete for the same binding site on the sodium-potassium ATPase. Low potassium increases digoxin binding and potentiates toxicity, which is why loop and thiazide diuretics increase risk.

Question 6Pharmacist Qualifying Examination Part I (MCQ)

Which counseling point is most important for a patient starting a new prescription of sublingual nitroglycerin?

  1. Take the tablet with food to reduce stomach upset.
  2. Sit or lie down before taking a dose to avoid syncope. Correct answer.
  3. Swallow the tablet with a full glass of water.
  4. Store the tablets in a warm, humid environment.

Explanation

Nitroglycerin causes venodilation and can produce marked hypotension and syncope, particularly in the upright position. Patients should sit or lie down before each dose and rise slowly afterward.

Question 7Pharmacist Qualifying Examination Part I (MCQ)

Which medication is most strongly associated with serotonin syndrome when combined with an SSRI?

  1. Metformin
  2. Ranitidine
  3. Atorvastatin
  4. Tramadol Correct answer.

Explanation

Tramadol inhibits serotonin reuptake in addition to its opioid activity, so combining it with an SSRI can precipitate serotonin syndrome. The risk is well documented and warrants avoidance or close monitoring.

Question 8Pharmacist Qualifying Examination Part I (MCQ)

A patient with a history of asthma should avoid which class of medications because of the risk of bronchoconstriction?

  1. Angiotensin-converting enzyme inhibitors
  2. Thiazide diuretics
  3. Selective beta-1 blockers such as bisoprolol
  4. Nonselective beta-blockers such as propranolol Correct answer.

Explanation

Nonselective beta-blockers block beta-2 receptors in the airways and can provoke bronchospasm in patients with asthma. Cardioselective agents are preferred when a beta-blocker is necessary, at the lowest effective dose.

Question 9Pharmacist Qualifying Examination Part I (MCQ)

A patient presents with a prescription for a controlled substance that appears altered. What is the most appropriate initial action for the pharmacist?

  1. Refuse to dispense without further communication and notify the patient only.
  2. Substitute a non-controlled alternative without prescriber input.
  3. Dispense the prescription and document the concern afterward.
  4. Contact the prescriber to verify the prescription before dispensing. Correct answer.

Explanation

Verification with the prescriber is the standard approach when a controlled prescription appears altered or otherwise suspicious. It protects patient safety and satisfies the pharmacist's legal and professional obligations before any dispensing decision.

Question 10Pharmacist Qualifying Examination Part I (MCQ)

A patient with chronic kidney disease has a creatinine clearance of 25 mL/min. Which adjustment is most appropriate for a renally cleared drug with a narrow therapeutic index?

  1. Use the standard adult dose without modification.
  2. Increase the dose to compensate for reduced absorption.
  3. Double the dose and monitor less frequently.
  4. Maintain the usual dose but extend the dosing interval or reduce the dose. Correct answer.

Explanation

For renally eliminated drugs with a narrow therapeutic index, dose reduction or interval extension prevents accumulation and toxicity. The magnitude of adjustment depends on the fraction of drug cleared renally and should be paired with therapeutic monitoring.

Question 11Pharmacist Qualifying Examination Part I (MCQ)

Which finding best supports a diagnosis of syndrome of inappropriate antidiuretic hormone secretion (SIADH) in a patient taking a new medication?

  1. Euvolemic hyponatremia with high urine osmolality Correct answer.
  2. Hypernatremia with low urine osmolality
  3. Hypovolemic hypernatremia with dilute urine
  4. Hyperkalemia with metabolic alkalosis

Explanation

SIADH produces euvolemic hyponatremia with inappropriately concentrated urine and continued sodium excretion. The combination of low serum sodium and high urine osmolality in a clinically euvolemic patient is characteristic.

Question 12Pharmacist Qualifying Examination Part I (MCQ)

A patient on warfarin is prescribed trimethoprim-sulfamethoxazole for a urinary tract infection. What is the most appropriate monitoring plan?

  1. Increase the warfarin dose to offset antibiotic effects.
  2. Discontinue warfarin for the duration of antibiotic therapy.
  3. Check the INR within a few days and monitor for bleeding. Correct answer.
  4. No additional monitoring is needed for a short course.

Explanation

Trimethoprim-sulfamethoxazole inhibits CYP2C9 and displaces warfarin from protein binding, raising the INR and bleeding risk. Close INR monitoring within days of starting the antibiotic allows timely dose adjustment.

Question 13Pharmacist Qualifying Examination Part I (MCQ)

Which instruction is most appropriate for a patient using a metered-dose inhaler with a spacer device?

  1. Actuate the inhaler immediately after beginning a slow, deep inhalation.
  2. Exhale fully into the spacer before actuating the inhaler.
  3. Actuate the inhaler into the spacer, then inhale slowly and deeply. Correct answer.
  4. Inhale rapidly and forcefully to maximize drug deposition.

Explanation

With a spacer, the dose is actuated into the chamber and the patient then inhales slowly and deeply to draw the aerosol into the lungs. This technique reduces oropharyngeal deposition and improves delivery compared with poor coordination using the inhaler alone.

Question 14Pharmacist Qualifying Examination Part I (MCQ)

A pregnant patient in the second trimester requires treatment for nausea and vomiting. Which agent is generally considered a first-line pharmacologic option?

  1. Isotretinoin
  2. Warfarin
  3. Doxylamine with pyridoxine Correct answer.
  4. Lisinopril

Explanation

Delayed-release doxylamine combined with pyridoxine is a first-line therapy for nausea and vomiting of pregnancy with a reassuring safety record. Non-pharmacologic measures are usually tried first, but this combination is appropriate when medication is needed.

Question 15Pharmacist Qualifying Examination Part I (MCQ)

A patient with type 2 diabetes on empagliflozin reports genital itching and discharge. Which adverse effect is most consistent with this presentation?

  1. Genital mycotic infection Correct answer.
  2. Diabetic ketoacidosis
  3. Weight gain
  4. Hypoglycemia

Explanation

SGLT2 inhibitors increase urinary glucose, which promotes growth of Candida and other organisms in the genital tract. Genital mycotic infections are a well-recognized adverse effect and usually respond to topical antifungal therapy.

Question 16Pharmacist Qualifying Examination Part I (MCQ)

A patient with Parkinson disease is started on carbidopa-levodopa. Which counseling point is most accurate regarding timing of administration?

  1. Take with antacids to prevent gastrointestinal upset.
  2. Take only at bedtime to reduce daytime dyskinesia.
  3. Take on an empty stomach, but adjust timing if nausea occurs. Correct answer.
  4. Take with a high-protein meal to improve absorption.

Explanation

Levodopa is absorbed best on an empty stomach, but gastrointestinal intolerance is common. Taking doses with a small low-protein snack can improve tolerability without substantially impairing absorption.

Question 17Pharmacist Qualifying Examination Part I (MCQ)

Which laboratory finding is most characteristic of a hypersensitivity reaction to allopurinol?

  1. Hypercalcemia with hyperphosphatemia
  2. Eosinophilia with rash and hepatic enzyme elevation Correct answer.
  3. Elevated INR with thrombocytopenia
  4. Isolated hyperkalemia

Explanation

Allopurinol hypersensitivity syndrome presents with rash, fever, eosinophilia, and hepatic or renal involvement. Recognition is important because the reaction can be severe and requires prompt discontinuation.

Question 18Pharmacist Qualifying Examination Part I (MCQ)

A patient is prescribed a transdermal fentanyl patch. Which counseling statement is most appropriate?

  1. Apply the patch to the same site each time to improve adhesion.
  2. Cut the patch to adjust the dose.
  3. Apply to clean, intact, non-irritated skin and rotate sites. Correct answer.
  4. Use a heating pad over the patch to enhance absorption.

Explanation

Fentanyl patches should be applied to clean, dry, non-hairy skin without cuts or irritation and rotated to avoid local reactions. Consistent application technique is important because absorption is affected by skin integrity and temperature.

Question 19Pharmacist Qualifying Examination Part I (MCQ)

A patient on lithium therapy presents with tremor, vomiting, and confusion. Which factor is most likely to have precipitated lithium toxicity?

  1. A high-sodium diet
  2. Dehydration from a gastrointestinal illness Correct answer.
  3. Moderate caffeine use
  4. Increased fluid intake

Explanation

Dehydration reduces renal lithium clearance and concentrates the drug, precipitating toxicity. Sodium depletion or water loss from vomiting or diarrhea is a common trigger, and lithium levels should be checked urgently.

Question 20Pharmacist Qualifying Examination Part I (MCQ)

A patient with an acute exacerbation of asthma presents with frequent use of a short-acting beta-2 agonist. Which additional therapy is most appropriate for long-term control?

  1. Inhaled corticosteroid Correct answer.
  2. Oral decongestant
  3. Long-acting beta-2 agonist monotherapy
  4. Inhaled anticholinergic monotherapy

Explanation

Inhaled corticosteroids are the cornerstone of long-term asthma control because they reduce airway inflammation. A short-acting bronchodilator provides rescue relief but does not treat the underlying inflammatory process.

Question 21Pharmacist Qualifying Examination Part I (MCQ)

Which pharmacokinetic principle best explains why a drug with a large volume of distribution requires a loading dose to achieve therapeutic concentrations quickly?

  1. The drug is highly protein bound.
  2. The drug undergoes extensive first-pass metabolism.
  3. The drug distributes extensively into tissues, so a larger amount is needed to fill that space. Correct answer.
  4. The drug is eliminated unchanged by the kidneys.

Explanation

A large volume of distribution means the drug partitions extensively into tissue compartments, so a proportionally larger loading dose is needed to reach the target concentration. The loading dose is calculated from the volume of distribution and the desired concentration.

Question 22Pharmacist Qualifying Examination Part I (MCQ)

A patient on warfarin is started on rifampin for tuberculosis. What is the expected effect on the INR and why?

  1. The INR will rise because rifampin inhibits CYP2C9.
  2. The INR will be unchanged because rifampin does not affect warfarin.
  3. The INR will rise because rifampin displaces warfarin from albumin.
  4. The INR will fall because rifampin induces hepatic enzymes that increase warfarin metabolism. Correct answer.

Explanation

Rifampin is a potent inducer of hepatic enzymes, including CYP2C9 and CYP3A4, which increases warfarin metabolism and reduces its anticoagulant effect. The INR typically falls, so warfarin doses often need to be increased with close monitoring.

Question 23Pharmacist Qualifying Examination Part I (MCQ)

A patient with cirrhosis develops ascites and is prescribed spironolactone. Which monitoring parameter is most important to assess the drug's efficacy and safety?

  1. Complete blood count with differential
  2. Serum potassium and creatinine Correct answer.
  3. Thyroid-stimulating hormone
  4. Serum amylase and lipase

Explanation

Spironolactone is a potassium-sparing diuretic, and patients with cirrhosis are at risk of hyperkalemia and renal dysfunction. Monitoring potassium and creatinine is essential to detect these complications and guide dose adjustment.

Question 24Pharmacist Qualifying Examination Part I (MCQ)

Which statement best explains why a drug with a narrow therapeutic index requires therapeutic drug monitoring even when the patient is clinically stable?

  1. Small changes in concentration can produce toxicity or loss of efficacy. Correct answer.
  2. The drug is not affected by drug interactions.
  3. The drug has no measurable plasma concentration.
  4. The drug is always eliminated by zero-order kinetics.

Explanation

For narrow therapeutic index drugs, the margin between effective and toxic concentrations is small, so modest changes in concentration can have serious consequences. Monitoring helps confirm that the patient remains within the therapeutic range despite changes in renal or hepatic function, adherence, or interacting drugs.

Question 25Pharmacist Qualifying Examination Part I (MCQ)

A patient with a history of angioedema while taking an ACE inhibitor is prescribed a new antihypertensive. Which class is most appropriate to avoid because of the risk of recurrent angioedema?

  1. Angiotensin II receptor blockers Correct answer.
  2. Dihydropyridine calcium channel blockers
  3. Beta-blockers
  4. Thiazide diuretics

Explanation

ARBs act on the same renin-angiotensin system and can cause angioedema, including in patients who reacted to an ACE inhibitor. Because cross-reactivity is possible, alternative classes are generally preferred after ACE inhibitor–associated angioedema.

Question 26Pharmacist Qualifying Examination Part I (MCQ)

A 68-year-old man with heart failure and reduced ejection fraction is stabilized on bisoprolol, sacubitril-valsartan, and spironolactone. His eGFR is 38 mL/min/1.73 m². Which agent added to this regimen most improves survival and reduces hospitalization but requires monitoring of potassium and renal function within one to two weeks of initiation?

  1. Digoxin
  2. Dapagliflozin Correct answer.
  3. Amlodipine
  4. Furosemide

Explanation

SGLT2 inhibitors such as dapagliflozin reduce cardiovascular death and heart failure hospitalization in HFrEF regardless of diabetes status, and initiation warrants checking renal function and potassium because of the risk of volume depletion and hyperkalemia when combined with renin-angiotensin blockade and a mineralocorticoid receptor antagonist. Loop diuretics, digoxin, and dihydropyridine calcium channel blockers relieve symptoms or control rate but do not confer this mortality benefit.

Question 27Pharmacist Qualifying Examination Part I (MCQ)

Which laboratory parameter should be monitored most closely in a patient receiving long-term therapy with both furosemide and digoxin?

  1. Serum bilirubin
  2. Serum potassium Correct answer.
  3. Serum phosphate
  4. Serum amylase

Explanation

Loop diuretics cause hypokalemia and hypomagnesemia, and hypokalemia potentiates digoxin toxicity by increasing myocardial binding of the glycoside. Potassium (with magnesium) must therefore be followed closely in patients on this combination.

Question 28Pharmacist Qualifying Examination Part I (MCQ)

A patient with an acute gout flare and a history of peptic ulcer disease needs anti-inflammatory therapy. Which regimen is most appropriate?

  1. Indomethacin suppositories
  2. Low-dose aspirin daily
  3. High-dose naproxen until symptoms resolve
  4. Oral prednisone tapered over 5 to 10 days Correct answer.

Explanation

Systemic corticosteroids such as a short prednisone taper are effective for acute gout and avoid the gastrointestinal ulcer risk of NSAIDs in a patient with prior peptic ulcer disease. NSAIDs and low-dose aspirin are poor choices here because of mucosal injury risk and, for aspirin, lack of adequate anti-inflammatory effect at low doses.

Question 29Pharmacist Qualifying Examination Part I (MCQ)

Which counseling statement is most appropriate for a patient prescribed alendronate 70 mg once weekly for postmenopausal osteoporosis?

  1. Take at bedtime with a calcium supplement
  2. Take with breakfast and lie down for 30 minutes afterward
  3. Take with coffee to improve absorption
  4. Take on an empty stomach with a full glass of water and remain upright for at least 30 minutes Correct answer.

Explanation

Oral bisphosphonates have very low bioavailability that is further reduced by food and drink, and they can cause severe esophagitis, so the dose must be taken with plain water on an empty stomach while remaining upright for at least 30 minutes. Lying down, taking with food or coffee, or co-administering calcium undermines absorption or increases esophageal injury.

Question 30Pharmacist Qualifying Examination Part I (MCQ)

A patient taking phenelzine for refractory depression develops a severe headache and markedly elevated blood pressure after eating aged cheese. Which mechanism best explains this event?

  1. Increased serotonin release from dietary tryptophan
  2. Inhibition of monoamine oxidase allows tyramine to trigger a hypertensive crisis Correct answer.
  3. Direct stimulation of beta-2 receptors by cheese proteins
  4. Blockade of peripheral alpha-1 receptors causes reflex tachycardia

Explanation

Phenelzine is an irreversible monoamine oxidase inhibitor, so dietary tyramine from aged cheese escapes gut and hepatic metabolism and displaces stored norepinephrine, producing a hypertensive crisis. This is the classic cheese reaction and is the reason for dietary tyramine restriction.

Question 31Pharmacist Qualifying Examination Part I (MCQ)

Which antiemetic is most appropriate for prevention of chemotherapy-induced nausea and vomiting when given with a neurokinin-1 receptor antagonist and dexamethasone before a highly emetogenic regimen?

  1. Ondansetron Correct answer.
  2. Metoclopramide
  3. Prochlorperazine
  4. Scopolamine

Explanation

A 5-HT3 receptor antagonist such as ondansetron is a cornerstone of prophylaxis for highly emetogenic chemotherapy and is combined with a neurokinin-1 antagonist and dexamethasone. Metoclopramide, prochlorperazine, and scopolamine are used in other contexts and are not the standard 5-HT3 component of this regimen.

Question 32Pharmacist Qualifying Examination Part I (MCQ)

A 30-year-old woman with epilepsy who is planning pregnancy is taking valproate. Which change is most appropriate?

  1. Add folic acid and continue valproate at the same dose
  2. Switch to a lower-risk antiepileptic such as lamotrigine or levetiracetam before conception Correct answer.
  3. Stop all antiepileptic drugs during pregnancy
  4. Continue valproate because seizure control outweighs all fetal risk

Explanation

Valproate carries the highest risk of major congenital malformations and neurodevelopmental impairment among common antiepileptics, so where possible it should be replaced before conception with an agent such as lamotrigine or levetiracetam. Folic acid supplementation is advisable but does not offset valproate's teratogenicity, and abrupt discontinuation risks status epilepticus.

Question 33Pharmacist Qualifying Examination Part I (MCQ)

Which finding is most consistent with a diagnosis of myxedema coma in a patient with hypothyroidism?

  1. Hypernatremia, fever, and agitation
  2. Hyperkalemia with peaked T waves
  3. Hyponatremia, hypothermia, and depressed consciousness Correct answer.
  4. Metabolic alkalosis with hyperventilation

Explanation

Myxedema coma is severe decompensated hypothyroidism characterized by altered mental status, hypothermia, and often hyponatremia and bradycardia. The other clusters describe hyperthyroid storm, hyperkalemia, or respiratory alkalosis rather than myxedema.

Question 34Pharmacist Qualifying Examination Part I (MCQ)

A patient with type 2 diabetes on metformin and glimepiride reports recurrent episodes of sweating, tremor, and confusion relieved by eating. Which action is most appropriate?

  1. Discontinue metformin
  2. Increase the glimepiride dose
  3. Add a bedtime snack and continue unchanged
  4. Reduce or stop glimepiride Correct answer.

Explanation

Glimepiride is a sulfonylurea that stimulates insulin secretion independently of glucose and is the most likely cause of hypoglycemia in this regimen. Metformin rarely causes hypoglycemia alone, so the sulfonylurea dose should be reduced or stopped and therapy reassessed.

Question 35Pharmacist Qualifying Examination Part I (MCQ)

Which monitoring is most important for a patient starting amiodarone for atrial fibrillation?

  1. Thyroid function, liver enzymes, and pulmonary status Correct answer.
  2. Complete blood count only
  3. Serum amylase and lipase only
  4. Serum uric acid

Explanation

Amiodarone accumulates in tissue and can cause thyroid dysfunction, hepatotoxicity, and pulmonary fibrosis, so baseline and periodic assessment of thyroid function, liver enzymes, and pulmonary symptoms is essential. It can also prolong the QT interval and interact with warfarin and digoxin.

Question 36Pharmacist Qualifying Examination Part I (MCQ)

A patient is prescribed warfarin and reports starting a course of rifampin. Which change in INR is expected and why?

  1. INR will be unchanged because rifampin does not affect warfarin
  2. INR will fall because rifampin induces hepatic enzymes and increases warfarin metabolism Correct answer.
  3. INR will rise because rifampin displaces warfarin from albumin
  4. INR will rise because rifampin inhibits CYP2C9

Explanation

Rifampin is a potent inducer of hepatic cytochrome P450 enzymes and increases the metabolism of warfarin, so its anticoagulant effect and the INR fall, often requiring an increased warfarin dose. When rifampin is later stopped, enzyme induction resolves and the INR can rise, so close monitoring is needed at both transitions.

Question 37Pharmacist Qualifying Examination Part I (MCQ)

Which agent is most appropriate for initial treatment of a patient with newly diagnosed primary open-angle glaucoma and no contraindications?

  1. Topical atropine
  2. Topical latanoprost Correct answer.
  3. Oral prednisone
  4. Oral acetazolamide long term

Explanation

Topical prostaglandin analogs such as latanoprost are first-line for open-angle glaucoma because they lower intraocular pressure effectively with once-daily dosing and few systemic effects. Long-term oral acetazolamide causes systemic acidosis and other adverse effects and is reserved for selected situations, while atropine and prednisone do not lower intraocular pressure.

Question 38Pharmacist Qualifying Examination Part I (MCQ)

A patient with major depressive disorder has been taking sertraline for two weeks and reports new insomnia, restlessness, and mild nausea. Which explanation is most appropriate?

  1. They indicate an allergic reaction requiring epinephrine
  2. They indicate that the dose is too low and should be doubled
  3. These are common early adverse effects that often diminish with continued therapy Correct answer.
  4. They indicate serotonin syndrome and the drug must be stopped immediately

Explanation

SSRIs commonly cause transient nausea, insomnia, and activation early in therapy, and these effects frequently subside over several weeks. Serotonin syndrome would present with more severe features such as clonus, hyperthermia, and autonomic instability rather than isolated mild symptoms.

Question 39Pharmacist Qualifying Examination Part I (MCQ)

Which vaccine is contraindicated in a patient with severe combined immunodeficiency?

  1. Hepatitis B
  2. Tetanus-diphtheria
  3. Measles-mumps-rubella Correct answer.
  4. Inactivated influenza

Explanation

Live attenuated vaccines such as measles-mumps-rubella are contraindicated in severe immunodeficiency because of the risk of disseminated infection. Inactivated vaccines like influenza, hepatitis B, and tetanus-diphtheria are safe and often recommended.

Question 40Pharmacist Qualifying Examination Part I (MCQ)

A patient with chronic kidney disease and a creatinine clearance of 20 mL/min is prescribed enoxaparin for venous thromboembolism prophylaxis. Which adjustment is most appropriate?

  1. Switch to unfractionated heparin only if bleeding occurs
  2. Double the dose to overcome reduced absorption
  3. Use standard prophylactic dosing without change
  4. Reduce the dose or extend the dosing interval because enoxaparin is renally cleared Correct answer.

Explanation

Enoxaparin is eliminated largely by the kidneys, so in severe renal impairment the dose should be reduced or the interval extended, or unfractionated heparin considered, to limit accumulation and bleeding risk. Standard dosing without adjustment increases the risk of over-anticoagulation.

Question 41Pharmacist Qualifying Examination Part I (MCQ)

Which statement best describes the role of N-acetylcysteine in acetaminophen overdose?

  1. It restores glutathione and detoxifies the reactive metabolite NAPQI Correct answer.
  2. It enhances renal excretion of unchanged acetaminophen
  3. It blocks opioid receptors to reverse CNS depression
  4. It directly binds acetaminophen in the gut and prevents absorption

Explanation

N-acetylcysteine replenishes hepatic glutathione, allowing conjugation and detoxification of the reactive metabolite NAPQI that accumulates when normal pathways are saturated. It is most effective when given early, ideally within 8 to 10 hours of ingestion.

Question 42Pharmacist Qualifying Examination Part I (MCQ)

A patient is admitted with opioid overdose and is given naloxone with improvement, but develops recurrent respiratory depression 45 minutes later. Which explanation is most appropriate?

  1. The initial dose was too high and caused rebound
  2. Naloxone causes delayed respiratory depression as an adverse effect
  3. Naloxone is metabolized to a toxic metabolite
  4. Naloxone's duration of action is shorter than that of many opioids Correct answer.

Explanation

Naloxone has a relatively short half-life compared with many opioids, so as its effect wanes the opioid can again produce respiratory depression. Patients require continued monitoring and often repeat doses or an infusion.

Question 43Pharmacist Qualifying Examination Part I (MCQ)

Which counseling point is most appropriate for a patient prescribed oral iron for iron-deficiency anemia?

  1. Take at the same time as levothyroxine
  2. Take with antacids to reduce stomach upset
  3. Take with milk to improve tolerability
  4. Take on an empty stomach with vitamin C to enhance absorption Correct answer.

Explanation

Oral iron is best absorbed on an empty stomach, and vitamin C can enhance absorption by maintaining iron in the ferrous state. Antacids, milk, and levothyroxine reduce iron absorption, and iron also reduces levothyroxine absorption, so they should be separated.

Question 44Pharmacist Qualifying Examination Part I (MCQ)

A patient with bipolar disorder on lithium presents with coarse tremor, ataxia, vomiting, and confusion at a lithium level of 2.8 mmol/L. Which initial management is most appropriate?

  1. Hold lithium, provide supportive care, and consider hemodialysis for severe toxicity Correct answer.
  2. Increase the lithium dose to stabilize mood
  3. Give a nonsteroidal anti-inflammatory drug for the tremor
  4. Start a thiazide diuretic to promote excretion

Explanation

A level of 2.8 mmol/L with neurologic and gastrointestinal signs indicates significant lithium toxicity; lithium should be held and supportive care provided, with hemodialysis considered for severe or life-threatening cases. Thiazides and NSAIDs reduce lithium clearance and would worsen toxicity.

Question 45Pharmacist Qualifying Examination Part I (MCQ)

Which laboratory abnormality is most characteristic of a hypersensitivity reaction to allopurinol?

  1. Eosinophilia with elevated transaminases Correct answer.
  2. Isolated hypoglycemia
  3. Isolated hyperkalemia
  4. Isolated hypercalcemia

Explanation

Allopurinol hypersensitivity syndrome presents with fever, rash, eosinophilia, hepatitis, and worsening renal function, so eosinophilia with elevated transaminases is the most characteristic pattern. Isolated electrolyte abnormalities do not define this reaction.

Question 46Pharmacist Qualifying Examination Part I (MCQ)

A patient with asthma is prescribed propranolol for migraine prophylaxis. Which concern is most important?

  1. It may cause hyperthyroidism
  2. It may cause hyperkalemia
  3. It may cause hypercalcemia
  4. It may cause bronchoconstriction and should be avoided in asthma Correct answer.

Explanation

Nonselective beta-blockers such as propranolol block beta-2 receptors in the airways and can precipitate bronchospasm in patients with asthma. A cardioselective agent or a non-beta-blocker alternative is generally preferred for migraine prophylaxis in asthma.

Question 47Pharmacist Qualifying Examination Part I (MCQ)

A patient taking clopidogrel after coronary stenting is prescribed omeprazole for reflux. Which statement is most accurate?

  1. Omeprazole should replace clopidogrel to prevent reflux
  2. Omeprazole increases clopidogrel activation and raises bleeding risk
  3. There is no interaction between omeprazole and clopidogrel
  4. Omeprazole may reduce clopidogrel activation via CYP2C19 inhibition, so an alternative acid suppressant may be preferred Correct answer.

Explanation

Clopidogrel is a prodrug requiring CYP2C19 activation, and omeprazole inhibits this enzyme, potentially reducing the antiplatelet effect. Pantoprazole or another agent with less CYP2C19 inhibition is often preferred when acid suppression is needed.

Question 48Pharmacist Qualifying Examination Part I (MCQ)

Which counseling point is most appropriate for a patient using a sublingual nitroglycerin tablet for angina?

  1. Swallow the tablet with water for faster effect
  2. Chew the tablet before swallowing
  3. Place it under the tongue and sit down because it may cause dizziness Correct answer.
  4. Take it only after the pain has resolved

Explanation

Sublingual nitroglycerin is absorbed through the oral mucosa and should be placed under the tongue, not swallowed, and patients should sit because vasodilation can cause hypotension and syncope. It is taken at the onset of angina, not after pain resolves.

Question 49Pharmacist Qualifying Examination Part I (MCQ)

A patient with a history of angioedema while taking an ACE inhibitor requires a new antihypertensive. Which class is most appropriate to avoid?

  1. Dihydropyridine calcium channel blockers
  2. Beta-blockers
  3. Thiazide diuretics
  4. Angiotensin receptor blockers Correct answer.

Explanation

Angioedema from ACE inhibitors is bradykinin-mediated, and angiotensin receptor blockers can occasionally cross-react, so ARBs are generally avoided or used with caution after ACE inhibitor angioedema. Thiazides, dihydropyridine calcium channel blockers, and beta-blockers do not share this mechanism.

Question 50Pharmacist Qualifying Examination Part I (MCQ)

Which pharmacokinetic parameter best explains why a drug with a large volume of distribution requires a loading dose to reach therapeutic concentrations quickly?

  1. Half-life alone determines the loading dose
  2. Bioavailability has no effect on loading dose calculation
  3. Clearance determines the loading dose independent of volume
  4. Volume of distribution determines the amount of drug needed to achieve a target plasma concentration Correct answer.

Explanation

Loading dose is calculated as the product of target concentration and volume of distribution divided by bioavailability, so a large volume of distribution requires a larger loading dose to fill the apparent tissue reservoir. Clearance governs maintenance dosing rather than the initial loading amount.