Arbidol HCl is primarily used as an antiviral medication, particularly effective against influenza viruses. It works by inhibiting the fusion of the viral envelope with the host cell membrane, thereby preventing viral entry and replication. This makes it a valuable tool in the treatment and prevention of influenza A and B infections. Additionally, it has shown potential in managing other respiratory viral infections, including those caused by coronaviruses, by similar mechanisms. Its immunomodulatory properties also help enhance the body's immune response, making it useful in reducing the severity and duration of viral illnesses. Research continues to explore its efficacy against emerging viral strains and its role in combination therapies.