Astellas Pharma IncAstellas Pharma Inc. and XenoPort, Inc. have announced that a new drug application (NDA) has been filed with the Pharmaceuticals and Medical Device Agency (PMDA) in Japan for ASP8825 (gabapentin enacarbil), also known as XP13512, as a potential treatment for restless legs syndrome (RLS). The acceptance of filing of the NDA triggers a $5 million milestone payment from Astellas to XenoPort.

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