Ampicillin is used in the treatment of a variety of infections due to susceptible organisms. They include biliary-tract infections, bronchitis, endocarditis, epiglottitis, gastroenteritis (including Escherichia coli enteritis, salmonella enteritis and shigellosis), gonorrhea, listeriosis, bacterial meningitis, otitis media, peritonitis, pneumonia, septicemia, typhoid and paratyphoid fever and urinary tract infections.