Which medication is an example of a broad-spectrum antibiotic?

• A. Verapamil
• B. Levofloxacin
• C. Hydrochlorothiazide
• D. Pantoprazole

Answer: (B)

Levofloxacin is a broad-spectrum antibiotic that belongs to the fluoroquinolone class of medications. It is effective against a wide variety of gram-positive and gram-negative bacteria, making it useful for treating infections in various body systems, including respiratory, urinary tract, and skin infections. The broad-spectrum nature of levofloxacin is due to its ability to inhibit bacterial DNA gyrase and topoisomerase IV, essential enzymes for bacterial DNA replication and transcription.

In contrast, the other medications listed serve different purposes. Verapamil is primarily a calcium channel blocker used to treat hypertension and certain heart conditions. Hydrochlorothiazide is a thiazide diuretic, used to manage high blood pressure and fluid retention. Pantoprazole is a proton pump inhibitor, which is utilized for conditions related to excessive stomach acid, such as gastroesophageal reflux disease (GERD). Each of these medications has a specific and limited scope of action, targeting specific physiological processes rather than a broad range of bacterial infections.