Influenza agent Tamiflu is effective in preventing symptoms of influenza H1N1. And the approaches of different groups of people. Scientists from Stanford University School of Medicine found that Tamiflu, the most commonly used against influenza – are often effective in preventing symptoms of influenza. due to the fact that the worldwide stockpile of drugs, in light of possible use against the spreading H1N1, and against the influenza viruses that may emerge in the future, were combined and analyzed data from seven studies published between 1999 and 2007 . In all these studies indicated that patients with laboratory-confirmed influenza, while taking Tamiflu symptoms developed to a lesser extent than patients in the control group receiving placebo. While taking Tamiflu had not experienced the full fever, headache and muscle aches, cough, and they continued to be infected with influenza. this medication is known for its ability to reduce symptoms and shorten the illness. six of the seven earlier studies conducted by pharmaceutical companies. to provide a meta-analysis was carried out huge work on the choice of 1900 research, which would severely methodologically capture statistically and clinically significant results. Analyzed the results of the seven works, sweeping study of more than 7,000 uninfected people who received Tamiflu within four weeks or more. the Working Group draws attention not only on the results of previous studies, but also the composition of the study and the one who sponsored the study. Their findings to the group built solely on the results of randomized, placebo-controlled, double-blind studies. using such a strict approach to test material, the group gave this assessment: – About one case for 25 people taking Tamiflu, the drugs prevent the flu. Of course, not all of these 25 people will be infected during seasonal influenza outbreaks, the risk of contracting influenza during seasonal influenza outbreaks in seven studies ranged between 6 and 14 percent. Basically, Tamiflu was well tolerated. None of the earlier studies have not been reported any severe side effects, including neurological and psychiatric disorders, in any age or ethnic groups. the authors stressed that have not been investigated nor children under 12 years old or persons with immune diseases, although these groups are considered as the most disadvantaged in terms of risk of infection with influenza. Were not investigated and the persons vaccinated against influenza of any of the live attenuated vaccines. due to the fact that Tamiflu has shown activity in preventing symptoms of influenza, it can be used to fight with the observed worldwide flu intractable to treatment with other medicines. Although the analysis concerned the reduction of influenza-like symptoms in the case of people getting the flu who took Tamiflu with the goals of prevention, do not forget about the occurrence of asymptomatic cases of influenza.