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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.
âWhat people notice when they take an antiviral drug for flu treatment is they feel better faster,â said Susan Rehm, MD, an infectious disease specialist and medical director for the National Foundation for Infectious Diseases. âAntivirals may also be prescribed to help prevent the spread of flu, Dr. Rehm said.