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Kuwait MOH Pharmacist Exam study materials
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Kuwait MOH Pharmacist Exam practice questions

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Question 1Pharmacology

Which mechanism best explains the bactericidal action of benzylpenicillin against susceptible bacteria?

  1. Inhibition of bacterial DNA gyrase
  2. Blocking peptidoglycan cross-linking Correct answer.
  3. Blockade of the 30S ribosomal subunit
  4. Disruption of the cytoplasmic membrane

Explanation

Beta-lactam antibiotics acylate the transpeptidase enzymes (penicillin-binding proteins) that cross-link peptidoglycan, so the growing cell wall cannot withstand osmotic pressure and the dividing bacterium lyses. Because the target is unique to bacteria, selectivity against human cells is high.

Question 2Pharmacology

Aspirin produces its anti-inflammatory and analgesic effects mainly through which action?

  1. Irreversible inhibition of cyclooxygenase Correct answer.
  2. Inhibition of lipoxygenase and reduced leukotriene synthesis
  3. Receptor antagonism at prostaglandin sites on nociceptors
  4. Inhibition of phospholipase A2 and reduced arachidonic acid release

Explanation

Aspirin acetylates a serine residue in cyclooxygenase-1 and cyclooxygenase-2, permanently inactivating the enzyme, so platelets in particular cannot regenerate it. The resulting fall in prostaglandin and thromboxane synthesis explains the analgesic, antipyretic, anti-inflammatory and antiplatelet effects.

Question 3Pharmacology

Which agent is the specific pharmacological antidote used to reverse warfarin in a patient with major bleeding?

  1. Protamine sulfate
  2. Vitamin K1 (phytonadione) Correct answer.
  3. Idarucizumab
  4. Desmopressin acetate

Explanation

Warfarin inhibits vitamin K epoxide reductase, lowering functional factors II, VII, IX and X. Vitamin K1 restores substrate for the carboxylase and directly antagonises warfarin; in major bleeding it is given intravenously together with prothrombin complex concentrate for immediate factor replacement.

Question 4Pharmacology

Which agent is used to neutralise the anticoagulant effect of unfractionated heparin?

  1. Andexanet alfa
  2. Vitamin K1
  3. Idarucizumab
  4. Protamine sulfate Correct answer.

Explanation

Protamine sulfate is a strongly basic protein that binds the acidic heparin molecule to form an inactive complex, and 1 mg neutralises approximately 100 units of unfractionated heparin. It reverses unfractionated heparin and partially reverses low molecular weight heparin.

Question 5Pharmacology

Which oral antidiabetic agent is recommended as first-line pharmacotherapy for most patients with newly diagnosed type 2 diabetes mellitus?

  1. Glibenclamide
  2. Pioglitazone
  3. Sitagliptin
  4. Metformin Correct answer.

Explanation

Metformin lowers hepatic glucose production and improves peripheral insulin sensitivity without stimulating insulin secretion, so it does not cause hypoglycaemia when used alone and is weight-neutral. It is therefore the preferred initial agent unless contraindicated by significant renal impairment or other risk factors for lactic acidosis.

Question 6Pharmacology

A patient using an inhaled salbutamol inhaler reports fine tremor of the hands. Which mechanism best explains this effect?

  1. Cholinergic rebound from muscarinic blockade
  2. Hypokalaemia induced by beta-2 stimulation
  3. Direct toxic damage to skeletal muscle fibres
  4. Beta-2 stimulation of skeletal muscle Correct answer.

Explanation

Beta-2 adrenergic receptors are present on skeletal muscle, and their stimulation produces tremor, which is a common dose-related adverse effect of beta-2 agonists such as salbutamol. It usually lessens with continued use and can be reduced by using the lowest effective dose and good inhaler technique.

Question 7Pharmacology

Which adverse effect is most characteristic of long-term oral prednisolone therapy?

  1. Bradycardia
  2. Hyperthyroidism
  3. Osteoporosis Correct answer.
  4. Hypoglycaemia

Explanation

Glucocorticoids reduce intestinal calcium absorption, increase renal calcium excretion and suppress osteoblast activity, leading to accelerated bone loss and fragility fractures with prolonged use. They also cause hyperglycaemia, weight gain, skin thinning and adrenal suppression.

Question 8Pharmacology

Which effect is expected during therapy with a typical antimuscarinic agent such as oxybutynin?

  1. Dry mouth Correct answer.
  2. Increased sweating
  3. Miosis
  4. Bradycardia

Explanation

Muscarinic blockade reduces secretions from salivary and other glands, so dry mouth is the most frequently reported anticholinergic adverse effect. Other expected effects include constipation, urinary retention, blurred vision, tachycardia and confusion in older patients.

Question 9Pharmacology

A drug obeys first-order elimination and has a plasma half-life of 6 hours. Approximately what fraction of an intravenous bolus dose remains in the body 18 hours later?

  1. One-half
  2. One-sixteenth
  3. One-eighth Correct answer.
  4. One-quarter

Explanation

In first-order kinetics a constant fraction is eliminated per unit time, so the concentration halves with each half-life. Eighteen hours equals three half-lives, leaving (1/2)^3, that is one-eighth, of the original amount.

Question 10Pharmacology

How does a competitive antagonist alter the dose-response curve of a full agonist?

  1. Leftward with an increased maximal response
  2. Rightward with a reduced maximal response
  3. Rightward shift, unchanged maximum Correct answer.
  4. Downward with no change in EC50

Explanation

A competitive antagonist binds reversibly at the same site as the agonist, so higher agonist concentrations can displace it and still achieve the full maximal effect. The result is a parallel rightward shift of the curve with no change in the maximum, provided the agonist concentration can be raised sufficiently.

Question 11Pharmacology

Persistent dry cough developing during enalapril therapy is attributed to accumulation of which mediator?

  1. Angiotensin II
  2. Renin
  3. Bradykinin Correct answer.
  4. Aldosterone

Explanation

Angiotensin-converting enzyme is identical to kininase II, so inhibiting it also reduces the breakdown of bradykinin and substance P in the respiratory tract. These accumulate and provoke the characteristic dry cough, which usually resolves within days of switching to an angiotensin receptor blocker.

Question 12Pharmacology

Which pair of toxicities is most characteristic of gentamicin therapy?

  1. Nephrotoxicity and ototoxicity Correct answer.
  2. Bone marrow aplasia and alopecia
  3. Hepatotoxicity and photosensitivity
  4. Cataracts and hyperglycaemia

Explanation

Aminoglycosides accumulate in proximal tubular cells and in hair cells of the cochlea and vestibule, producing dose- and duration-related renal impairment and irreversible hearing or balance loss. Risk is increased by high trough levels, prolonged therapy, loop diuretics and other nephrotoxins, so plasma levels and renal function should be monitored.

Question 13Pharmacology

Which electrolyte disturbance most strongly predisposes a patient to digoxin toxicity?

  1. Hypocalcaemia
  2. Hypokalaemia Correct answer.
  3. Hyperchloraemia
  4. Hypernatraemia

Explanation

Digoxin binds to the extracellular potassium site of Na+/K+-ATPase, so when extracellular potassium is low more digoxin binds and inhibition of the pump increases. Hypokalaemia, often caused by concomitant diuretics, therefore enhances toxicity, and hypercalcaemia and hypomagnesaemia act similarly.

Question 14Pharmacology

Which drug is a potent inducer of hepatic CYP3A4 and typically lowers the effect of co-administered substrates?

  1. Erythromycin
  2. Cimetidine
  3. Rifampicin Correct answer.
  4. Ketoconazole

Explanation

Rifampicin activates the pregnane X receptor and markedly increases transcription of CYP3A4 and several other enzymes, so plasma levels of substrates such as oral contraceptives, warfarin and many antiretrovirals fall. Enzyme induction develops over one to two weeks and resolves slowly after the drug is stopped.

Question 15Pharmacology

Which measure most effectively prevents the vancomycin infusion reaction characterised by flushing of the face and upper trunk?

  1. Increasing the dose and reducing the infusion volume
  2. Rapid bolus injection followed by a saline flush
  3. Premedication with oral antihistamine before each dose
  4. Slower infusion over at least 60 minutes Correct answer.

Explanation

The reaction results from non-immunological histamine release from mast cells triggered by rapid exposure to vancomycin, so it is rate-related rather than IgE-mediated. Extending each infusion to at least 60 minutes, and often to 90 to 120 minutes in higher doses, prevents most episodes.

Question 16Pharmacology

Clarithromycin is prescribed to a patient already taking another QT-prolonging medicine. Which finding on monitoring is of greatest concern?

  1. Nephrogenic diabetes insipidus
  2. QT prolongation with torsades de pointes Correct answer.
  3. Progressive peripheral neuropathy
  4. Hepatic fibrosis with portal hypertension

Explanation

Macrolides such as clarithromycin block the rapid delayed rectifier potassium current, prolonging repolarisation and the QT interval. When combined with other QT-prolonging drugs, or in the presence of hypokalaemia or bradycardia, the risk of polymorphic ventricular tachycardia (torsades de pointes) increases substantially.

Question 17Pharmacology

To maximise absorption, levothyroxine tablets should be taken in which way?

  1. Immediately after a high-fibre meal
  2. At bedtime with a glass of milk
  3. On an empty stomach before breakfast Correct answer.
  4. With calcium and iron supplements at breakfast

Explanation

Levothyroxine absorption is reduced by food, calcium, iron, magnesium, aluminium and dietary fibre, which bind the drug in the gut. A consistent dose taken 30 to 60 minutes before breakfast on an empty stomach, and separated from interacting supplements by at least four hours, gives the most predictable serum TSH response.

Question 18Pharmacology

Which agent is used as an antidote to reverse benzodiazepine-induced sedation?

  1. Flumazenil Correct answer.
  2. Naloxone
  3. Atropine
  4. Physostigmine

Explanation

Flumazenil is a competitive antagonist at the benzodiazepine binding site on the GABA-A receptor complex and rapidly reverses sedation and respiratory depression caused by benzodiazepines. It must be used cautiously because it can precipitate seizures in patients who are dependent on benzodiazepines or who have co-ingested a tricyclic antidepressant.

Question 19Pharmacology

Which mechanism best explains the hypokalaemia commonly produced by furosemide?

  1. Increased distal Na+ delivery and K+ secretion Correct answer.
  2. Inhibition of Na+/K+-ATPase in skeletal muscle
  3. Blockade of potassium channels in the collecting duct
  4. Direct blockade of aldosterone receptors

Explanation

Loop diuretics inhibit the Na+/K+/2Cl- cotransporter in the thick ascending limb, so more sodium reaches the distal nephron where it is reabsorbed in exchange for potassium. Enhanced aldosterone action on that sodium load plus increased distal flow therefore raise urinary potassium loss.

Question 20Pharmacology

Compared with regular human insulin, insulin lispro is characterised by which property?

  1. A higher risk of injection-site lipohypertrophy
  2. Faster onset and shorter duration of action Correct answer.
  3. Slower subcutaneous absorption
  4. A longer duration of action

Explanation

In insulin lispro the reversal of proline and lysine at positions 28 and 29 of the B chain reduces self-association, so hexamer dissociation and subcutaneous absorption are faster. It is therefore given immediately before meals and has a shorter duration of action, lowering the risk of post-meal and late hypoglycaemia.

Question 21Pharmacology

Phenytoin elimination becomes capacity-limited within the therapeutic range. What is the practical consequence of a small increase in daily dose?

  1. A fall in plasma concentration due to enzyme induction
  2. A predictable proportional rise in plasma level
  3. A disproportionate rise in plasma level Correct answer.
  4. No change in plasma concentration

Explanation

When metabolising enzymes approach saturation, elimination switches from first-order to zero-order kinetics and a fixed amount of drug is cleared per unit time. A modest dose increment then produces a much larger than expected rise in steady-state concentration, so small dose adjustments with level monitoring are required.

Question 22Pharmacology

Leucovorin (folinic acid) is given after high-dose methotrexate in order to do which of the following?

  1. Inhibit dihydrofolate reductase more potently
  2. Replenish reduced folates in normal tissues Correct answer.
  3. Enhance renal excretion of methotrexate
  4. Increase methotrexate uptake into tumour cells

Explanation

Methotrexate inhibits dihydrofolate reductase and depletes reduced folates, and leucovorin is already in the reduced form so it bypasses that block and rescues normal rapidly dividing tissues. Because tumour cells take up leucovorin less avidly and methotrexate is cleared, the antitumour effect is largely preserved when rescue is timed correctly.

Question 23Pharmacology

A patient stabilised on simvastatin is prescribed a course of clarithromycin. Which interaction is of greatest clinical concern?

  1. Displacement of simvastatin from plasma albumin
  2. CYP3A4 inhibition causing statin accumulation Correct answer.
  3. Reduced statin absorption leading to loss of efficacy
  4. Increased clarithromycin renal clearance

Explanation

Simvastatin is cleared mainly by CYP3A4, and clarithromycin is a potent mechanism-based inhibitor of that enzyme. Plasma statin concentrations can rise many-fold, increasing the risk of myopathy and rhabdomyolysis with acute kidney injury, so the statin is usually withheld or temporarily replaced during the antibiotic course.

Question 24Pharmacology

Why do sulfonamides precipitate haemolysis in a patient with glucose-6-phosphate dehydrogenase deficiency?

  1. They inhibit haem synthesis in the bone marrow
  2. Oxidative stress that NADPH deficiency cannot counter Correct answer.
  3. They increase red cell membrane fragility by binding spectrin
  4. They cause immune-complex deposition on the red cell membrane

Explanation

G6PD generates NADPH, which keeps glutathione reduced and protects haemoglobin and the red cell membrane from oxidation. Sulfonamides are oxidant drugs, so in deficient red cells the oxidant challenge overwhelms this defence, causing Heinz body formation, methaemoglobinaemia and acute haemolytic anaemia.

Question 25Pharmacology

A drug has a volume of distribution of 40 L and a target plasma concentration of 5 mg/L. Assuming complete bioavailability, what intravenous loading dose is required?

  1. 1000 mg
  2. 45 mg
  3. 8 mg
  4. 200 mg Correct answer.

Explanation

The loading dose equals the volume of distribution multiplied by the desired plasma concentration when bioavailability is complete: 40 L × 5 mg/L = 200 mg. The loading dose fills the apparent distribution space at once, whereas maintenance dosing replaces the amount eliminated.

Question 26Pharmacology

A patient presents 6 hours after ingesting a large overdose of paracetamol. Intravenous acetylcysteine is started. Which action best explains its protective effect?

  1. Increases conjugation of paracetamol with glucuronic acid
  2. Replenishes hepatic glutathione stores Correct answer.
  3. Blocks hepatic CYP2E1-mediated oxidation of paracetamol
  4. Enhances renal excretion of unchanged paracetamol

Explanation

The toxic metabolite NAPQI is normally detoxified by conjugation with glutathione. In overdose glutathione is depleted, and acetylcysteine acts as a glutathione precursor and sulfhydryl donor, restoring this detoxification capacity.

Question 27Pharmacology

Aspirin produces its antiplatelet effect mainly through which mechanism?

  1. Activation of antithrombin III in plasma
  2. Reversible competitive blockade of platelet ADP receptors
  3. Irreversible acetylation of platelet cyclo-oxygenase Correct answer.
  4. Blockade of platelet glycoprotein IIb/IIIa receptors

Explanation

Aspirin covalently acetylates serine residues of cyclo-oxygenase, permanently inactivating the platelet enzyme. Because platelets cannot synthesise new enzyme, the effect lasts for the platelet lifespan of about 7 to 10 days.

Question 28Pharmacology

Which adverse effect is the principal concern when metformin is continued in a patient with advanced renal impairment?

  1. Weight gain
  2. Lactic acidosis Correct answer.
  3. Acute pancreatitis
  4. Severe hypoglycaemia

Explanation

Metformin increases anaerobic glucose metabolism and reduces hepatic gluconeogenesis, and it is cleared unchanged by the kidney. When renal function falls, drug accumulation can precipitate lactic acidosis, which is why the dose is restricted or the drug stopped at low estimated glomerular filtration rates.

Question 29Pharmacology

At usual therapeutic doses, atenolol preferentially blocks which receptor subtype?

  1. Beta-2 adrenergic receptors
  2. Muscarinic M2 receptors
  3. Alpha-1 adrenergic receptors
  4. Beta-1 adrenergic receptors Correct answer.

Explanation

Atenolol is a cardioselective beta-blocker, so at standard doses it antagonises beta-1 receptors in the heart in preference to beta-2 receptors in the airways and vasculature. Selectivity is dose-dependent and is lost at high doses.

Question 30Pharmacology

Warfarin exerts its anticoagulant effect by which mechanism?

  1. Activating antithrombin III
  2. Inhibiting vitamin K epoxide reductase Correct answer.
  3. Directly blocking thrombin catalytic activity
  4. Inhibiting platelet thromboxane synthesis

Explanation

Warfarin inhibits vitamin K epoxide reductase, preventing regeneration of reduced vitamin K. This reduces gamma-carboxylation of factors II, VII, IX and X, so functionally inactive factors are secreted.

Question 31Pharmacology

Which laboratory test is used to monitor unfractionated heparin therapy?

  1. Activated partial thromboplastin time Correct answer.
  2. Bleeding time
  3. Prothrombin time expressed as INR
  4. Platelet aggregometry

Explanation

Unfractionated heparin potentiates antithrombin and principally prolongs the intrinsic pathway, which is assessed by the activated partial thromboplastin time. Therapy is titrated to a target aPTT ratio, usually 1.5 to 2.5 times control.

Question 32Pharmacology

A woman with hypertension controlled on ramipril becomes pregnant. Which best describes the main hazard of continuing the drug?

  1. Fetal renal damage and oligohydramnios Correct answer.
  2. No fetal risk, because ramipril does not cross the placenta
  3. Isolated maternal hyperkalaemia with no fetal effect
  4. Only neonatal hypoglycaemia, so the drug may be continued safely

Explanation

ACE inhibitors cross the placenta and block fetal angiotensin II formation, which is needed to maintain fetal renal perfusion and amniotic fluid volume. Second and third trimester exposure causes fetal renal failure, oligohydramnios and skull hypoplasia, so the drug should be stopped when pregnancy is confirmed.

Question 33Pharmacology

A patient with chronic kidney disease receives regular morphine. Accumulation of morphine-6-glucuronide is expected to produce which clinical consequence?

  1. Reduced analgesia requiring larger doses
  2. Direct dose-related hepatotoxicity
  3. Prolonged sedation and respiratory depression Correct answer.
  4. Serotonin syndrome with hyperthermia

Explanation

Morphine-6-glucuronide is an active metabolite that is renally eliminated and is more potent than morphine at the mu receptor. When it accumulates in renal impairment, opioid effects intensify, so sedation and respiratory depression are the main hazards.

Question 34Pharmacology

Penicillins exert their bactericidal action through which mechanism?

  1. Inhibiting DNA gyrase
  2. Blocking the 30S ribosomal subunit
  3. Inhibiting peptidoglycan cross-linking Correct answer.
  4. Disrupting the cytoplasmic membrane

Explanation

Beta-lactams bind penicillin-binding proteins, which are transpeptidases that cross-link peptidoglycan. Loss of cross-linking weakens the cell wall so that the organism lyses under osmotic pressure, an effect seen only in actively dividing bacteria.

Question 35Pharmacology

A young woman taking metoclopramide develops involuntary facial spasms and neck twisting. Which mechanism explains these effects?

  1. Excessive histamine H1 blockade in the brainstem
  2. Serotonin 5-HT3 receptor antagonism
  3. Dopamine D2 receptor blockade in the basal ganglia Correct answer.
  4. Muscarinic receptor stimulation in the striatum

Explanation

Metoclopramide blocks dopamine D2 receptors both in the chemoreceptor trigger zone and in the basal ganglia. Striatal D2 blockade removes dopaminergic inhibition of cholinergic output, producing acute dystonia, particularly in young patients.

Question 36Pharmacology

Which electrolyte abnormality is most likely to arise during spironolactone therapy?

  1. Hypomagnesaemia
  2. Hypocalcaemia
  3. Hypokalaemia
  4. Hyperkalaemia Correct answer.

Explanation

Spironolactone antagonises aldosterone at the mineralocorticoid receptor in the distal nephron, reducing sodium reabsorption and potassium secretion. Potassium therefore tends to be retained, and hyperkalaemia is the characteristic risk, especially when the drug is combined with ACE inhibitors or renal impairment is present.

Question 37Pharmacology

Which monitoring is essential after lithium carbonate is started for bipolar disorder?

  1. Serum lithium levels with renal and thyroid function Correct answer.
  2. Serum calcium every three months
  3. Weekly liver function tests
  4. Monthly full blood count alone

Explanation

Lithium has a narrow therapeutic index and is eliminated renally, so plasma concentrations must be checked regularly to avoid toxicity. It also causes nephrogenic diabetes insipidus and hypothyroidism over time, so renal and thyroid function are monitored together with lithium levels.

Question 38Pharmacology

Clopidogrel is a prodrug activated by CYP2C19. A patient stabilised on clopidogrel is prescribed omeprazole. Which consequence is most likely?

  1. No interaction, because omeprazole is renally eliminated
  2. Enhanced clopidogrel activation through enzyme induction
  3. Increased bleeding from higher clopidogrel concentrations
  4. Reduced antiplatelet effect and higher thrombotic risk Correct answer.

Explanation

Omeprazole inhibits CYP2C19, the enzyme that converts clopidogrel to its active thiol metabolite. Less active metabolite is formed, platelet inhibition is attenuated, and the risk of cardiovascular thrombotic events rises, so an alternative acid-suppressing agent is preferred.

Question 39Pharmacology

A drug follows first-order kinetics and has a plasma half-life of 12 hours. A constant dosing regimen is started. Approximately how long is needed to reach steady state?

  1. 36 hours
  2. 12 hours
  3. 7 to 10 days
  4. 2 to 3 days Correct answer.

Explanation

With first-order elimination, steady state is approached after about 4 to 5 half-lives, independent of dose. For a 12-hour half-life this corresponds to 48 to 60 hours, roughly 2 to 3 days.

Question 40Pharmacology

A farm worker presents with salivation, miosis, bronchorrhoea and muscle fasciculations after pesticide exposure. In addition to atropine, which agent is indicated?

  1. Naloxone
  2. Acetylcysteine
  3. Pralidoxime Correct answer.
  4. Flumazenil

Explanation

The picture is organophosphate poisoning with acetylcholine excess at muscarinic and nicotinic synapses. Atropine reverses the muscarinic features, while pralidoxime reactivates acetylcholinesterase by removing the phosphate group from the enzyme, which is needed to counter the nicotinic effects.

Question 41Clinical Pharmacy and Therapeutics

Which medication is recommended as initial pharmacologic therapy for most adults with newly diagnosed type 2 diabetes mellitus?

  1. Pioglitazone
  2. Metformin Correct answer.
  3. Insulin glargine
  4. Glibenclamide

Explanation

Metformin is the preferred initial agent for most adults with type 2 diabetes because it lowers glucose without causing hypoglycemia or weight gain. Sulfonylureas and insulin can cause hypoglycemia, and pioglitazone causes fluid retention. Insulin is usually added later or used when metformin is contraindicated.

Question 42Clinical Pharmacy and Therapeutics

A patient taking warfarin presents with major bleeding and an elevated INR. Which agent provides the most rapid replacement of functional clotting factors?

  1. Intravenous vitamin K
  2. Four-factor PCC Correct answer.
  3. Idarucizumab
  4. Protamine sulfate

Explanation

Major warfarin-related bleeding requires rapid replacement of vitamin K-dependent clotting factors, and four-factor prothrombin complex concentrate does this within minutes. Intravenous vitamin K supports synthesis but takes hours to act. Protamine reverses heparin, and idarucizumab reverses dabigatran.

Question 43Clinical Pharmacy and Therapeutics

Which adverse effect is most characteristic of ACE inhibitors such as enalapril?

  1. Reflex tachycardia
  2. Fasting hypoglycemia
  3. Dry persistent cough Correct answer.
  4. Ankle edema

Explanation

ACE inhibitors reduce bradykinin breakdown in the lung, producing a dry, persistent cough in a minority of patients. It is the most characteristic class-specific adverse effect. Switching to an angiotensin receptor blocker usually resolves it.

Question 44Clinical Pharmacy and Therapeutics

Which inhaler is used as a reliever for acute asthma symptoms?

  1. Salbutamol inhaler Correct answer.
  2. Fluticasone inhaler
  3. Salmeterol inhaler
  4. Tiotropium inhaler

Explanation

Short-acting beta-2 agonists such as salbutamol relieve acute bronchospasm within minutes and are used as reliever therapy. Inhaled corticosteroids and long-acting agents are controller medications. Tiotropium is a long-acting bronchodilator used for maintenance.

Question 45Clinical Pharmacy and Therapeutics

Statins lower LDL cholesterol by inhibiting which enzyme?

  1. HMG-CoA reductase Correct answer.
  2. Lipoprotein lipase
  3. PCSK9 protease
  4. Cholesteryl ester transfer protein

Explanation

Statins competitively inhibit HMG-CoA reductase, the rate-limiting enzyme in hepatic cholesterol synthesis. Reduced intracellular cholesterol increases LDL receptor expression and lowers plasma LDL. The other enzymes listed are not the statin target.

Question 46Clinical Pharmacy and Therapeutics

Which antidote is used for acetaminophen overdose?

  1. Naloxone hydrochloride
  2. Glucagon injection
  3. N-acetylcysteine Correct answer.
  4. Flumazenil injection

Explanation

Acetaminophen is metabolized to NAPQI, which depletes glutathione; acetylcysteine replenishes glutathione and detoxifies NAPQI. It is most effective when started early after overdose. Naloxone, flumazenil, and glucagon reverse other poisonings.

Question 47Clinical Pharmacy and Therapeutics

Which insulin is classified as rapid-acting?

  1. Insulin detemir
  2. Insulin regular
  3. Insulin lispro Correct answer.
  4. Insulin glargine

Explanation

Insulin lispro is a rapid-acting analog with onset around 15 minutes, suitable for mealtime dosing. Regular insulin is short-acting but slower, and glargine and detemir are long-acting basal insulins.

Question 48Clinical Pharmacy and Therapeutics

Which antihypertensive class is preferred first-line for a patient with type 2 diabetes and albuminuria?

  1. Alpha blocker
  2. Beta blocker
  3. ACE inhibitor Correct answer.
  4. Thiazide diuretic

Explanation

ACE inhibitors reduce intraglomerular pressure and slow progression of albuminuric diabetic kidney disease, so they are preferred first-line in this setting. Beta blockers, thiazides, and alpha blockers lack this renal-protective evidence.

Question 49Clinical Pharmacy and Therapeutics

Which medication reduces mortality in heart failure with reduced ejection fraction by inhibiting neprilysin and the angiotensin receptor?

  1. Sacubitril/valsartan Correct answer.
  2. Digoxin tablets
  3. Amlodipine besylate
  4. Furosemide injection

Explanation

Sacubitril/valsartan combines a neprilysin inhibitor with an angiotensin receptor blocker and reduces mortality in HFrEF compared with enalapril. Amlodipine, furosemide, and digoxin may relieve symptoms but do not provide the same mortality benefit.

Question 50Clinical Pharmacy and Therapeutics

Which antibiotic commonly causes a disulfiram-like reaction when taken with alcohol?

  1. Amoxicillin
  2. Clarithromycin
  3. Doxycycline
  4. Metronidazole Correct answer.

Explanation

Metronidazole inhibits aldehyde dehydrogenase, so alcohol ingestion can cause a disulfiram-like reaction with flushing, nausea, and hypotension. Patients should avoid alcohol during treatment and for at least 24-48 hours afterward. The other agents do not produce this reaction.