Tonix Pharmaceuticals surges after FDA nod for non-opioid pain drug

** Drugmaker Tonix Pharmaceuticals' TNXP.O shares surge 19.5% to $60.83 in extended trading

** U.S. Food and Drug Administration approves co's drug, Tonmya, to manage pain related to type of chronic condition called fibromyalgia

** Fibromyalgia causes widespread pain, fatigue as well as problems with sleep and memory

** Approval paves the way for the drug to be first new treatment option in over 15 years for patients

** The pill is designed for bedtime treatment to improve sleep quality and reduce pain associated with the chronic condition

** Stock up 55.7% YTD