Antibiotics are substances derived from microorganisms that inhibits or destroy the growth of other microorganisms. Antibiotics are used to treat infection caused by organisms that are sensitive to them usually bacterial or fungi. They alter the normal microbial content of the body (example in the lungs, bladder and intestine) by destroying one or more groups of harmless or beneficial organism, which may result in infection (such as thrush in woman due to over growth of resistances organisms. These side effects are most living to occur with broad-spectrum (those active against a wide variety of organisms (Nieves-Cordero, et al., 2005).
Resistances may develop by the microorganisms being treated, for example, through correct dosage or over prescription. Antibiotic should not be used to treat minor infection which will clear up unaided.