[Neuraminidase inhibitor, anti-influenzal agent--mechanism of action, and how to use clinically].

Neuraminidase inhibitor has changed the treatment of influenza dramatically. The drug is effective for both influenza A and B whereas amantadine, another anti-influenzal agent, inhibits influenza A virus infection but not B. Neuraminidase inhibitor blocks the process of release of influenza virus from infected cells and inhibit the virus transmission to the neighboring cells. Neuraminidase inhibitor improves the symptoms of influenza and shortens the duration of illness. It is emphasized that this drug should be given within forty-eight hours after the onset, and it must be not noted that the possibility of the drug resistant virus although it is observed infrequently. Prophylactic use of the drug is also discussed.