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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.
But some antiviral medicines (such as acyclovir or famciclovir) when taken orally (tablets) may be helpful in reducing the frequency and severity of attacks of cold sores. Doctors may prescribe oral antiviral medicines that can be taken daily to prevent future outbreaks of cold sores.