In 2017, the small firm Capnia Inc. merged with closely held Essentialis Inc. in a stock swap to create a company organized around addressing rare diseases. Renamed Soleno Therapeutics with the new stock symbol (NASDAQ:SLNO), the firm is usefully understood as a clinical-stage biopharmaceutical company developing novel therapeutics for the treatment of rare diseases. The firm's lead candidate - diazoxide choline controlled-release (DCCR) - is a once-daily oral tablet for the treatment of Prader-Willi syndrome (PWS), is currently being evaluated in an ongoing Phase 3 clinical development program