Norfloxacin is associated with which antibiotic class?

Norfloxacin is associated with which antibiotic class?

• A. Penicillin
• B. Cephalosporin
• C. Quinolones
• D. Macrolides

Answer: (C)

The main idea here is recognizing the antibiotic class by its mechanism and structure. Norfloxacin is a member of the quinolones, specifically the fluoroquinolones. These drugs work by inhibiting bacterial DNA gyrase and topoisomerase IV, which blocks DNA replication and leads to bacterial death. That mechanism places Norfloxacin squarely in the quinolones group, not with beta-lactams like penicillins or cephalosporins (which inhibit cell wall synthesis) or with macrolides (which inhibit protein synthesis by binding to the 50S ribosomal subunit). In clinical practice, quinolones cover many gram-negative pathogens and some gram-positive ones, all sharing this mechanism across the class. So Norfloxacin is associated with quinolones.

The main idea here is recognizing the antibiotic class by its mechanism and structure. Norfloxacin is a member of the quinolones, specifically the fluoroquinolones. These drugs work by inhibiting bacterial DNA gyrase and topoisomerase IV, which blocks DNA replication and leads to bacterial death. That mechanism places Norfloxacin squarely in the quinolones group, not with beta-lactams like penicillins or cephalosporins (which inhibit cell wall synthesis) or with macrolides (which inhibit protein synthesis by binding to the 50S ribosomal subunit). In clinical practice, quinolones cover many gram-negative pathogens and some gram-positive ones, all sharing this mechanism across the class. So Norfloxacin is associated with quinolones.