There are two types of neuraminidase inhibitors commonly available for treatment and prophylaxis of influenza infections: Zanamivir and Oseltamivir. They interfere with the release of progeny virions from infected host cells, prevent infection process of new host cells and stop spread of infection in respiratory tract by mimicking natural substrate and fitting into active site of neuraminidase enzyme. They interrupt the detachment of progeny virions. Viral replication rate is then reduced and that allows human immune system to destroy the remaining viruses.