Fluoroquinolones are the type of antibacterial agents more extensively used from the past few years and will be continued to be used even in the next decade. Discover fluoroquinolones' structure, mechanism of action, and antimicrobial activity. Learn classification for effective use. What Are Fluoroquinolones? Fluoroquinolones are a class of antibiotics approved to treat or prevent certain types of bacterial infections. Fluoroquinolones - Etiology, pathophysiology, symptoms, signs, diagnosis & prognosis from the Merck Manuals - Medical Professional Version.