Example of the fluoroquinolones is-

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2024

Explanation

Ofloxacin is a member of the fluoroquinolone class of antibiotics, which are synthetic, broad-spectrum antimicrobial agents.
Fluoroquinolones exert their bactericidal effect by inhibiting bacterial DNA gyrase (topoisomerase II) and topoisomerase IV.
These enzymes are crucial for bacterial DNA replication, transcription, and repair, so their inhibition leads to bacterial cell death.
Other common fluoroquinolones include ciprofloxacin, levofloxacin, and moxifloxacin.

Option A: Metronidazole is not a fluoroquinolone. It belongs to the nitroimidazole class of antibiotics.
Option C: Gentamycin is an aminoglycoside antibiotic, not a fluoroquinolone.
Option D: Erythromycin is a macrolide antibiotic, a different class from fluoroquinolones.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacology: Classification of Antibiotics as background academic context rather than a clinical decision trigger.
Understanding antibiotic classes is fundamental for safe nursing practice. It helps in anticipating specific adverse effects, such as the risk of tendonitis and tendon rupture associated with fluoroquinolones, or ototoxicity and nephrotoxicity with aminoglycosides like gentamycin.
Knowledge of different antibiotic classes is crucial for patient education, including instructions on administration, potential side effects, and the importance of completing the full course to prevent antibiotic resistance.
What if? - What if the patient was a child under 18 or a pregnant woman? Fluoroquinolones like Ofloxacin are generally used with caution or avoided in these populations due to the risk of cartilage damage (arthropathy). In such cases, an alternative antibiotic from a different class would be chosen based on the specific infection and susceptibility testing.

How to Approach the Question

This is a factual recall question from pharmacology.
First, identify the key term in the question stem, which is 'fluoroquinolones'.
Next, systematically evaluate each option to determine its pharmacological class.
Recall or deduce that Metronidazole is a nitroimidazole, Gentamycin is an aminoglycoside, and Erythromycin is a macrolide.
Identify Ofloxacin as a well-known member of the fluoroquinolone class.
Select the option that correctly matches the drug to the class requested in the question.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1693-1695

E6 Pharmacology KD Tripathi Essentials 9e Part 3 pp. 44-46, 41-43

Practise the full RUHS, Jaipur, PB B.Sc Nursing Entrance-2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.