Allergan plc and Adamas Pharmaceuticals, Inc. announced that the U.S. Food and Drug Administration (FDA) has approved a new, expanded label for NAMZARIC® (memantine and donepezil hydrochlorides) extended-release, a once-daily, fixed-dose combination of memantine hydrochloride (a NMDA receptor antagonist) and donepezil hydrochloride (an acetylcholinesterase inhibitor, AChEI).