Why most of the antibiotics are ineffective against viral diseases ?

Explanation

Antibiotics are generally low molecular mass organic compounds produced by microorganisms that act against the growth and development of other microorganisms. They are used as clinical drugs against bacterial pathogenase, but are ineffective against viruses. Many anitbiotics interfere with the pathogen protein synthesis. Some (e.g. Penicillin) prevent cross-linking of the glycon chains of peptidoglycan molecules in bacterial cell walls. Since the viruses do not possess cell wall and their own protein synthesizing apparatus, they are not attacked by antibiotics. The viruses are killed or inactivated by the antibodies of the attacked host.