Ampicillin is a beta-lactam bactericidal antibiotic which belong to the penicillin group. It has been used extensively to treat bacterial infections since 1961. Ampicillin is able to penetrate Gram-positive and some Gram-negative bacteria and destroy it from within.
Ampicillin is widely used for treating various types of infections that are usually caused by bacteria like ear infection, bladder infection, pneumonia, gonorrhea as well as E. coli or salmonella infections. It is sold in the UK under the brand name Omnipen, and in the US Principen, both for oral administration.