BUZZ-Nektar Therapeutics: FDA approves constipation drug
** Biotechnology company's shares up 3 pct at $13.94
** U.S. FDA approves oral therapy to treat opioid-induced constipation, co-developed with AstraZeneca Plc (NYSE: AZN - news)
** The drug will be sold under the trade name Movantik, and be launched in the first half of 2015, the companies said
** Up to Monday's close, stock had gained about 19 pct this year