Amoxicillin/clavulanic acid, also known as co-amoxiclav or amox-clav, sold under the brand names Augmentin, and Ranclav among others, is an antibiotic medication used for the treatment of a number of bacterial infections. [5] Amoxicillin/Clavulanate is a prescription medication used to treat the symptoms of bacterial infections such as sinusitis, pneumonia, ear infections, bronchitis, urinary tract infections, and infections of the skin. Learn about side effects, drug interactions, dosages, warnings, and more. Amoxicillin and clavulanate potassium is a combination medicine used to treat many different infections caused by bacteria, such as sinusitis, pneumonia, ear infections, bronchitis, urinary tract infections, and infections of the skin. Amoxicillin and clavulanate potassium is a combination antibiotic used to treat bacterial infections like sinusitis, pneumonia, UTIs, ear, skin, and bronchial infections. 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. Amoxicillin/clavulanate is a combination antibiotic medication used to treat various types of bacterial infections, including lower respiratory tract infections, pneumonia, ear infections, sinus infections, skin infections, urinary tract infections (UTIs), and others. 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.