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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.
For treatment, antiviral drugs should be started within 2 days after becoming sick. When used this way, these drugs can reduce the severity of flu symptoms and shorten the time you are sick by 1 or 2 days. They may also prevent serious flu complications.