SAN DIEGO--(BUSINESS WIRE)--Somaxon Pharmaceuticals, Inc. (Nasdaq: SOMX), a specialty pharmaceutical company, today announced that Silenor® (doxepin) now is commercially available by prescription in the United States. Somaxon has implemented a wholesale and retail stocking program to disseminate Silenor 3 mg and 6 mg dosepacks to pharmacies across the United States. Silenor is indicated for the treatment of insomnia characterized by difficulty with sleep maintenance.