Supernus Announces Paragraph IV ANDA Filing for Oxtellar XR(TM)

Supernus Pharmaceuticals, Inc.

today announced that on June 26, 2013 the Company received a Paragraph IV Notice Letter from Watson Laboratories, Inc. ("Watson") advising Supernus of the filing by Watson of an Abbreviated New Drug Application seeking approval for oxcarbazepine extended-release tablets. Supernus is currently reviewing the details of this Notice Letter and intends to vigorously enforce its intellectual property rights relating to Oxtellar XR. The product is currently protected by two issued patents that are listed in the FDA's Orange Book. About Supernus Pharmaceuticals, Inc. Supernus Pharmaceuticals, Inc. is a specialty pharmaceutical company focused on developing and commercializing products for the treatment of central nervous system, or CNS, diseases. The Company has one marketed product for epilepsy, Oxtellar XR^TM (extended release oxcarbazepine), and one tentatively approved product for epilepsy, Trokendi XR^TM (extended release topiramate). The Company is also developing several product candidates in psychiatry to address large market opportunities in ADHD, including ADHD patients with impulsive aggression. These product candidates include SPN-810 for impulsive aggression in ADHD and SPN-812 for ADHD.