First Approval of Generic Mometasone Furoate Nasal Suspension Spray in Japan: Similarities and Differences Between Japan and the USA.

The Ministry of Health, Labour and Welfare (MHLW) in Japan approved the first generic version of Nasonex in February 2018. The Pharmaceuticals and Medical Devices Agency requires in vitro, pharmacokinetic, and pharmacodynamic or clinical endpoint data to approve generic nasal spray drug products. However, the MHLW has not published basic principle for approving nasal generic drug products. Therefore, this article summarizes the data used for the approval of the first generic Nasonex based on publicly available data. Additionally, we compare the bioequivalence evaluations regarding the human studies based on the generic version of Nasonex between Japan and the USA.