Exhibit 99.1 - Joint Filers' Signatures Designated Filer: Forest Laboratories Holdings Limited Issuer & Ticker Symbol: Trevena, Inc. (TRVN) Date of Event Requiring Statement: January 30, 2014 FOREST LABORATORIES, INC. By: /s/ Francis I. Perier, Jr. Name: Francis I. Perier, Jr. Title: Executive Vice President - Chief Financial Officer Date: January 30, 2014 FL HOLDING C.V. By: /s/ Ralph Kleinman Name: Ralph Kleinman Title: Manager Date: January 30, 2014 FLI INTERNATIONAL LLC By: /s/Francis I. Perier, Jr. Name: Francis I. Perier, Jr. Title: Vice President Date: January 30, 2014