Overview: Amoxicillin/clavulanate is an antibiotic that is used for infections caused by certain bacteria. Common side effects include diarrhea, nausea, vomiting, or a rash. Serious side effects. Discover how the antibiotic Augmentin works, what bacterial infections it treats, and how to safely manage your prescribed dosage. Augmentin is prescription antibiotic used to treat many different infections caused by bacteria, such as sinusitis, pneumonia, ear infections, bronchitis, urinary tract infections, and infections of the skin. Augmentin is an oral antibacterial combination consisting of amoxicillin and the beta-lactamase inhibitor, and clavulanate potassium. Learn about dosages, side effects, drug interactions, and warnings. Learn about Augmentin (amoxicillin / clavulanate) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Amoxicillin and clavulanate combination is an antibiotic that belongs to the group of medicines known as penicillins and beta-lactamase inhibitors. It works by killing the bacteria and preventing their growth. However, this medicine will not work for colds, flu, or other virus infections. Amoxicillin /clavulanate is a combination antibacterial medication used to treat various types of bacterial infections. Amoxicillin is an antibiotic, while clavulanate does not have antibacterial activity, but instead prevents the degradation of amoxicillin by bacterial enzymes.