** Drugmaker’s shares up 22.3 pct at $1.26 in light premarket trading
** Co partners with Valeant Pharma’s unit OraPharma Inc to promote nasal spray SPRIX to dentists and dental specialists across the U.S.
** SPRIX nasal spray is a nonsteroidal drug for managing short-term, moderate-to-severe level pain in adults that requires analgesic at the opioid level
** Co says to begin promoting in Q1 as part of 2-year agreement, financial terms will not be disclosed
** Stock lost 87 pct in 2017 (Reporting by Medha Singh in Bengaluru)