No joke: Opioid constipation drugs are serious business By: CNBC.com News February 11, 2016 at 10:41 AM EST The market for drugs that target constipation from opiods will grow almost tenfold in the United States by 2019, one analyst projects. Read More >> Related Stocks: Astrazeneca Plc ADR Takeda Pharma Theravance Bio Ord