Antibiotic capsule. Gloved hand holding a red and yellow capsule of Amoxil 500, an antibiotic drug containing 500 milligrams of amoxycillin. Antibiotics treat infection by killing bacteria. Amoxil is effective against various bacteria, but nearly all Staphylococci sp. and some Escherichia coli strains are resistant. Rubber gloves help to maintain a sterile environment.