Alvimopan reduces certain side effects of narcotic medications that are often used to prevent pain caused by surgery. Narcotic medications can cause stomach pain, bloating, nausea, vomiting, and constipation. These side effects can delay recovery in patients undergoing gastrointestinal surgery. Alvimopan works by preventing these side effects without reducing the pain-relieving effects of the narcotic. Alvimopan is used to speed recovery of stomach and intestinal functions after a gastrointestinal surgery, and to prevent side effects caused by narcotic medications. Alvimopan may also be used for other purposes not listed in this medication guide.
Entereg is a drug that reduces certain side effects of narcotic medicines that are often used to prevent pain caused by surgery as narcotic medicine can cause stomach pain, bloating, nausea,vomiting and constipation. Entereg is in this case used to prevent all these side effects. You cannot use Entereg if you suffer from severe liver or kidney disease ot if you have used a narcotic drugs in a row just before your surgery.