Timiflu is an antiviral drug. It kills A and B influenza viruses in the body by stopping activity of the viruses. The main target of Tamiflu is to fight influenza viruses, including virus H1N1. You can use it if symptoms had lasted for less than two days. This medicine can also prevent influenza viruses. Tamiflu may also be useful for other health problems, which are not described here. If you have an allergy to Tamiflu or to some components it consists of don't use it. If you have an allergy to some drugs related to Tamiflu you should also avoid using of it. You should be careful in using it if you have kidney problems, heart disease, liver disease, mental or mood problems, breathing problems, lung disease. You may use this medicine alone or in complex with others drugs. But it's strongly recommended to not use it with prescription and nonprescription drugs, dietary medicine, herbal drugs. If you are going to be pregnant or already pregnant you should talk about using of Timiflu with your doctor. You should also ask your doctor if this medicine could be compound with other drugs you are taking. You should have consultancy with your doctor before using Timiflu to prevent negative effects.