Zanamivir INN /zəˈnaemɨvɪər/ zəˈnæmɨvɪər is a neuraminidase inhibitor used in the treatment and prophylaxis of influenza caused by Influenza a And b. Viruses it was developed by The australian biotech Firm Biota. holdingsn 2006, it was approved for prevention of influenza A and B. Zanamivir was the first neuraminidase inhibitor commercially developed.