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Antivirals are medications that help fight flu, according to the Centers for Disease Control and Prevention. They're available only with a prescription from a health care professional. Antiviral drugs work against viruses; they don't fight bacteria like antibiotics do.The two antivirals used as flu treatments are oseltamivir phosphate (Tamiflu) and zanamivir (Relenza).ntivirals are medications that help fight flu, according to the Centers for Disease Control and Prevention. They're available only with a prescription from a health care professional. Antiviral drugs work against viruses; they don't fight bacteria like antibiotics do.
These include oseltamivir and zanamivir, which can have side effects and are not appropriate or necessary for all people with the flu. Antiviral drugs may be prescribed only to people who are at a high risk of developing life-threatening complications of the flu, such as pneumonia or acute bronchitis.