Get our free Amoxicillin and clavulanate potassium coupon and be eligible to receive a discount. You can reduce your Amoxicillin and clavulanate potassium cost by up to 75% with our free Amoxicillin and clavulanate potassium discount card. Bring it to a participating pharmacy near you to save on your prescription medication.Amoxicillin is a penicillin antibiotic. It fights bacteria in your body. Amoxicillin is used to treat many different types of infections caused by bacteria, such as ear infections, bladder infections, pneumonia, gonorrhea, and E. coli or salmonella infection. Amoxicillin is also sometimes used together with another antibiotic called clarithromycin (Biaxin) to treat stomach ulcers caused by Helicobacter pylori infection. This combination is sometimes used with a stomach acid reducer called lansoprazole (Prevacid). Amoxicillin may also be used for purposes not listed in this medication guide.