Ribavirin, also known as tribavirin, is an anti-viral medication used to treat RSV infection, hepatitis C, and viral hemorrhagic fever. For hepatitis C it is used with other medications such as simeprevir, sofosbuvir, peginterferon alfa-2b or peginterferon alfa-2a. Among the viral hemorrhagic fevers it is used for Lassa fever, Crimean–Congo hemorrhagic fever, and Hantavirus infection but not Ebola or Marburg. Ribavirin is taken by mouth or inhaled.