Amoxicillin is a penicillin antibiotic used to treat bacterial infections such as tonsillitis, bronchitis, sinusitis, pneumonia, and infections of the ear, nose, throat, skin, or urinary tract. Amoxicillin 500mg and 250mg are available as tablets or capsules and as an oral suspension. Many brands and forms of amoxicillin are available, and not all brands are listed on this leaflet.