Which of the following is an example of a sulfa-containing non-antibiotic?

• A. Loop diuretics
• B. Dapsone
• C. SSZ
• D. Sulfonlyureas

Answer: (A)

Sulfa-containing non-antibiotics are drugs that have a sulfonamide group but do not act as antibiotics. Loop diuretics fit this pattern perfectly: they contain a sulfonamide moiety that’s important for their diuretic action, yet they do not kill bacteria, so they’re not antibiotics. That makes them a classic example of a sulfa-containing non-antibiotic.

Dapsone is a sulfone antibiotic, so it’s an antimicrobial, not a non-antibiotic sulfa drug. Sulfasalazine has a sulfonamide component but functions mainly as an anti-inflammatory/antirheumatic agent and contains an antibiotic-derived part, so it isn’t the clean example of a non-antibiotic sulfa drug. Sulfonylureas do not belong to the sulfa-containing non-antibiotic category in the same way, as their sulfonylurea structure is used for glucose regulation rather than providing a sulfonamide-based antifungal/antibacterial action.