Enrofloxacin belongs to what group of antibacterial drugs?

• A. Sulfonamides
• B. Fluoroquinolones
• C. Aminoglycosides
• D. Macrolides

Answer: (B)

Antibiotics are grouped by how they work, which helps explain why a drug fits a particular class. Enrofloxacin is a fluoroquinolone, a class that kills bacteria by blocking DNA replication. It does this by inhibiting DNA gyrase and topoisomerase IV, enzymes essential for twisting and untangling DNA during replication. This mechanism makes enrofloxacin bactericidal and gives it broad activity against many Gram-negative bacteria and some Gram-positive bacteria. The fluorinated quinolone structure is what identifies it as a fluoroquinolone.

Other drug groups work by different targets, so they don’t fit this classification. Sulfonamides inhibit folate synthesis, aminoglycosides disrupt protein synthesis at the 30S ribosomal subunit, and macrolides inhibit protein synthesis at the 50S ribosomal subunit.