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Aanamivir, antiviral drug that is active against both influenza type A and influenza type B viruses. Zanamivir and a similar agent called oseltamivir (marketed as Tamiflu) were approved in 1999 by the U.S. Food and Drug Administration and represented the first members in a new class of antiviral drugs known as neuraminidase inhibitors. Zanamivir is sold under the trade name Relenza by the pharmaceutical company GlaxoSmithKline. Zanamivir is given by inhalation only. By inhibiting the...