Clavulanic acid functions as which of the following?

• A. Beta-lactamase inhibitor
• B. Antibiotic
• C. Beta-lactam
• D. Proton pump inhibitor

Answer: (A)

Clavulanic acid’s role is to block bacterial beta-lactamases, the enzymes that would destroy beta-lactam antibiotics. By inhibiting these enzymes, it protects the accompanying antibiotic from hydrolysis, thereby broadening its effectiveness against resistant bacteria. It has little intrinsic antibiotic activity on its own and is not a beta-lactam antibiotic, nor is it a proton pump inhibitor. Clinically, it’s paired with penicillins (for example, amoxicillin) to overcome beta-lactamase–mediated resistance.