No laninamivir resistance has been reported. However it is a concern that resistance to laninamivir is similar to that of zanamivir because of the similarity in binding properties with the NA protein. Laninamivir octanoate (CS-8958), which is a prodrug of laninamivir (another inhaled NAI with long-acting properties), has also been approved in Japan and is commercially available under the name of Inavir (Daiichi Sankyo Company Ltd.