Respiratory tract infections: therapeutic approach MCQs With Answer

Respiratory tract infections: therapeutic approach MCQs With Answer

This quiz collection is designed for M.Pharm students preparing for Pharmacotherapeutics II (MPP 202T). It focuses on therapeutic strategies for upper and lower respiratory tract infections, integrating antimicrobial selection, mechanisms of action, dosing considerations, adverse effects, drug interactions, and special-population adjustments. Questions emphasize clinical pharmacology and rational antibiotic stewardship—choosing agents based on likely pathogens, resistance patterns, drug penetration into lung tissue, and safety profiles. Each MCQ tests applied knowledge required to recommend, monitor, and adjust therapies in real-world scenarios, helping build competence in evidence-based management of respiratory infections and improving readiness for exams and clinical decision-making.

Q1. Which of the following is the recommended first-line oral agent for outpatient community-acquired pneumonia in an otherwise healthy adult with no recent antibiotic use?

• Azithromycin
• Amoxicillin-clavulanate
• Levofloxacin
• Ceftriaxone

Correct Answer: Azithromycin

Q2. Which antiviral drug acts as a neuraminidase inhibitor and is commonly prescribed for early influenza infection?

• Acyclovir
• Oseltamivir
• Ribavirin
• Amantadine

Correct Answer: Oseltamivir

Q3. For confirmed methicillin-resistant Staphylococcus aureus (MRSA) pneumonia with good lung penetration and oral bioavailability, which agent is often preferred?

• Vancomycin
• Linezolid
• Daptomycin
• Nafcillin

Correct Answer: Linezolid

Q4. Which of the following antibiotics generally lacks reliable activity against Pseudomonas aeruginosa?

• Piperacillin-tazobactam
• Ceftazidime
• Ciprofloxacin
• Azithromycin

Correct Answer: Azithromycin

Q5. What is the primary mechanism of action of beta-lactam antibiotics in treating bacterial respiratory infections?

• Inhibition of folate synthesis by blocking dihydropteroate synthase
• Disruption of cell membrane integrity by binding lipopolysaccharide
• Inhibition of bacterial protein synthesis at the 30S ribosomal subunit
• Inhibition of bacterial cell wall synthesis by binding penicillin-binding proteins

Correct Answer: Inhibition of bacterial cell wall synthesis by binding penicillin-binding proteins

Q6. For an uncomplicated, clinically stable community-acquired pneumonia patient who has responded to therapy, what is the generally recommended minimum antibiotic duration?

• 3 days
• 5 days
• 7 days
• 10 days

Correct Answer: 5 days

Q7. Which common adverse effect is particularly associated with macrolide antibiotics such as azithromycin and erythromycin?

• Nephrotoxicity
• QT interval prolongation and risk of torsades de pointes
• Severe tendon rupture
• Pancreatitis

Correct Answer: QT interval prolongation and risk of torsades de pointes

Q8. Which of the following is used as passive immunoprophylaxis to prevent severe RSV disease in high-risk infants?

• Oseltamivir
• Palivizumab
• Zanamivir
• Acyclovir

Correct Answer: Palivizumab

Q9. Which combination constitutes the standard initial four‑drug regimen for active, drug-susceptible pulmonary tuberculosis?

• Isoniazid, Rifampicin, Pyrazinamide, Ethambutol
• Isoniazid, Streptomycin, Ethambutol, Ciprofloxacin
• Rifampicin, Amikacin, Pyrazinamide, Levofloxacin
• Isoniazid, Rifampicin, Clarithromycin, Doxycycline

Correct Answer: Isoniazid, Rifampicin, Pyrazinamide, Ethambutol

Q10. Rifampicin frequently causes clinically significant drug interactions primarily through which mechanism?

• CYP450 enzyme inhibition leading to increased drug levels
• P-glycoprotein inhibition causing decreased drug elimination
• CYP450 enzyme induction leading to reduced plasma levels of co‑administered drugs
• Direct displacement of drugs from plasma proteins

Correct Answer: CYP450 enzyme induction leading to reduced plasma levels of co‑administered drugs

Q11. When administering an aminoglycoside (e.g., gentamicin) to a patient with reduced renal function, which dosing adjustment principle is commonly employed to minimize toxicity while maintaining efficacy?

• Increase the dose and maintain the same dosing interval
• Decrease the dose but keep the same dosing interval
• Extend the dosing interval while maintaining an effective peak dose
• No change to dosing is necessary

Correct Answer: Extend the dosing interval while maintaining an effective peak dose

Q12. Fluoroquinolones exert bactericidal activity by targeting which bacterial enzymes?

• Peptidyl transferase and initiation factors
• DNA gyrase (topoisomerase II) and topoisomerase IV
• RNA polymerase beta subunit
• Folate pathway enzymes dihydrofolate reductase

Correct Answer: DNA gyrase (topoisomerase II) and topoisomerase IV

Q13. Which antibiotic is commonly recommended for aspiration pneumonia to provide anaerobic coverage?

• Clindamycin
• Cefuroxime
• Trimethoprim-sulfamethoxazole
• Aztreonam

Correct Answer: Clindamycin

Q14. Which antibiotic class is contraindicated in young children because it causes permanent tooth discoloration and impaired bone growth?

• Fluoroquinolones
• Tetracyclines (e.g., doxycycline)
• Macrolides
• Beta-lactams

Correct Answer: Tetracyclines (e.g., doxycycline)

Q15. For acute exacerbation of chronic obstructive pulmonary disease (COPD), which systemic corticosteroid regimen is commonly recommended to shorten recovery and reduce hospitalization?

• Prednisone 40 mg orally once daily for 5 days
• Hydrocortisone 100 mg IV every 8 hours for 14 days
• Dexamethasone 6 mg orally once weekly for 4 weeks
• No systemic corticosteroids should be used

Correct Answer: Prednisone 40 mg orally once daily for 5 days

Q16. Which antimicrobial commonly requires therapeutic drug monitoring due to risks of nephrotoxicity and ototoxicity?

• Gentamicin
• Azithromycin
• Levofloxacin
• Linezolid

Correct Answer: Gentamicin

Q17. Macrolide antibiotics inhibit bacterial protein synthesis by binding to which ribosomal subunit and interfering with which step?

• 30S subunit, preventing initiation complex formation
• 50S subunit, inhibiting translocation of the nascent peptide
• 30S subunit, causing misreading of mRNA
• 50S subunit, inhibiting peptidyl transferase activity directly

Correct Answer: 50S subunit, inhibiting translocation of the nascent peptide

Q18. For Legionella pneumophila pneumonia, which oral antibiotic class is considered highly effective due to good intracellular penetration?

• Beta-lactams (e.g., amoxicillin)
• Tetracyclines (e.g., doxycycline)
• Macrolides or respiratory fluoroquinolones (e.g., levofloxacin)
• Aminoglycosides (e.g., gentamicin)

Correct Answer: Macrolides or respiratory fluoroquinolones (e.g., levofloxacin)

Q19. After close exposure to influenza, which antiviral is recommended for chemoprophylaxis in high‑risk individuals if started within 48 hours of exposure?

• Ribavirin
• Oseltamivir
• Interferon alfa
• Acyclovir

Correct Answer: Oseltamivir

Q20. In patients with bronchiectasis and chronic Pseudomonas colonization, which inhaled antibiotic is frequently used for suppressive therapy to reduce exacerbation frequency?

• Inhaled tobramycin
• Oral amoxicillin
• Intravenous ceftriaxone
• Oral metronidazole

Correct Answer: Inhaled tobramycin

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