Amoxil (amoxicillin) belongs to a class of antibiotics called penicillins that subdue bacterial growth and fight against certain infections, such as pneumonia, tonsillitis, cost of cheap amoxil and some other infections caused by germs. Amoxicillin is used to treat many types cost of cheap amoxil infections caused by certain germs called "bacteria". It may be used alone or in combination with other antibiotics.