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New Relistor is indicated for the treatment of opoid-induced constipation...
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Methylnaltrexone (MTNX, tradename Relistor) is one of the newer agents of peripherally-acting μ-opioid antagonists that act to reverse some of the side effects of opioid drugs such as constipation without affecting analgesia or precipitating withdrawals. Because it contains a permanently charged tetravalent nitrogen atom, it cannot cross the blood-brain barrier, and so has antagonist effects throughout the body, counteracting effects such as itching and constipation, but without affecting opioid effects in the brain such as analgesia.
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