SAN DIEGO--(BUSINESS WIRE)--Somaxon Pharmaceuticals, Inc. (Nasdaq:SOMX), a specialty pharmaceutical company focused on the in-licensing and development of proprietary product candidates for the treatment of diseases and disorders in the fields of psychiatry and neurology, today announced that it has submitted a New Drug Application (NDA) to the U.S. Food and Drug Administration (FDA) for SILENOR™ (doxepin hydrochloride). Somaxon is seeking marketing approval of SILENOR™ for the treatment of insomnia.