Supernus Pharmaceuticals, Inc. (Nasdaq: SUPN), a biopharmaceutical company focused on developing and commercializing products for the treatment of central nervous system (CNS) diseases, today announced that the U.S. Food and Drug Administration (FDA) has acknowledged it has received the supplemental new drug application (sNDA) for Qelbree (viloxazine extended-release capsules) for the treatment of attention-deficit hyperactivity disorder (ADHD) in adult patients. The sNDA is now considered filed, with a user fee goal date (PDUFA date) of April 29, 2022.