Amoxicillin-clavulanic acid (Augmentin) is used for eyelid bacterial infections because it ...

• A. It is effective against MRSA
• B. It is only effective for conjunctivitis
• C. It has no beta-lactamase inhibitor
• D. It overcomes penicillinase with clavulanic acid

Answer: (D)

When a lid infection is caused by bacteria that make penicillinase (beta-lactamase), amoxicillin alone can be inactivated. Clavulanic acid blocks those enzymes, protecting the antibiotic so it can still kill the bacteria. This pairing broadens the drug’s reach to include beta-lactamase–producing organisms commonly involved in eyelid infections, which is why amoxicillin-clavulanic acid is used here. It’s not primarily about MRSA, which is usually resistant to beta-lactams even with clavulanic acid; it’s not limited to conjunctivitis, and the combination does include a beta-lactamase inhibitor, so those other statements don’t fit.