Amoxicillin is a medication that is used to treat a wide range of bacterial infections. This antibiotic is of the penicillin class. It acts by preventing bacterial growth. Amoxicillin is used to treat a variety of bacterial illnesses, including tonsillitis, bronchitis, pneumonia, and infections of the ear, nose, throat, skin, or urinary tract. A number of bacterial infections are frequently treated with the antibiotic amoxicillin 500mg. Only bacterial illnesses are treated by the antibiotic amoxicillin. For viral infections, it is ineffective. Common amoxicillin side effects may include nausea, vomiting, diarrhea, and rash.