AVDL - Avadel's Xyrem Competitor: A Quick Overview December, 15 2020 06:59 AM Avadel Pharmaceuticals plc Avadel's FT218 is claimed to be a better version of Xyrem. Xyrem, or rather sodium oxybate, is a multibillion-dollar market. Key competition now is, however, Xywav. For further details see: Avadel's Xyrem Competitor: A Quick Overview