Constipation common side effect of opiod use

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'"I don't know that many people who become addicted who say, 'I'm going to pick and choose what I'm going to be addicted to based on the side effect of that drug,'" said Paul Gileno, the president and founder of the advocacy nonprofit U.S. Pain Foundation, whose group has received grant money from AstraZeneca.
Opioid-induced constipation is so unmanageable that many legitimate opioid users quit the drugs and choose to live in pain instead, research suggests.'
http://medicalxpress.com/news/2016-02-su...didnt.html