| Viruses are the tiny organisms that cause innumerable infections in a living cell of the human body. These infections can further be prevented from spreading by consuming anti viral medications. These antiviral medicines restrict the one or more steps of viral replications without causing harmful side effects. The approved and effective anti viral drugs that are used for treating most of the viral infections are acyclovir, zidoyudine, idoxuridine, vidarabine, zalcitabine, ganciclovir, trifluridine, stavudine, didanosine, foscarnet etc. Today, the anti-viral drugs market accounts for a market share of 24 percent which is all set to reach US $ 25 billion by 2012. The diseases that can be cured by antiviral drugs are liver cancers, influenza, chickenpox, shingles, parkinsonism, asthenia, diarrhea, hepatitis, measles, herpes genitalis, lassa fever and other respiratory ailments.