Antibiotics are the medications that suppress activity and development of harmful microorganisms with the help of specific active ingredients containing in them. As a result the activity of harmful microorganisms gets lower and organism can recover quickly without complications. Divided into groups antibiotics posses their individual action that helps them to react only to those microorganisms which should be treated by a certain antibiotics group. Among them are antiviral medicines, antifungus and antiprotozoan drugs. Modern antibiotics provide effective action destroying only harmful microbes without affecting healthy cells.