** Shares of drugmaker Tonix Pharmaceuticals TNXP.O rise 16.2% to $18.43 premarket
** Co says its new drug Tonmya, the first treatment for fibromyalgia approved in more than 15 years, is now available by prescription at pharmacies across the U.S.
** Fibromyalgia is a chronic disorder causing widespread pain and fatigue
** Co's Tonmya, taken once daily at bedtime, is designed to relieve chronic pain that affects an estimated 10 million Americans, most of whom are women - TNXP
** Approval followed two late-stage trials showing significant pain reduction vs placebo at 14 weeks, co says
** Up to last close, stock down ~52% YTD
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com))