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Naloxegol (INN; PEGylated naloxol; [4] trade names Movantik and Moventig) is a peripherally acting μ-opioid receptor antagonist developed by AstraZeneca, licensed from Nektar Therapeutics, for the treatment of opioid-induced constipation. [5] It was approved in 2014 in adult patients with chronic, non-cancer pain. [6]
Methylnaltrexone (MNTX, brand name Relistor), used in form of methylnaltrexone bromide (INN, USAN, BAN), is a medication that acts as a peripherally acting μ-opioid receptor antagonist that acts to reverse some of the side effects of opioid drugs such as constipation without significantly affecting pain relief or precipitating withdrawals.
The closely related medication, methylnaltrexone (N-methylnaltrexone), is used to treat opioid-induced constipation but does not treat addiction as it does not cross the blood–brain barrier. Nalmefene (6-desoxy-6-methylenenaltrexone) is similar to naltrexone and is used for the same purposes as naltrexone.
Opioid drugs are known to cause opioid-induced constipation (OIC) by inhibiting gastric emptying and decreasing peristaltic waves leading to delayed absorption of medications and more water absorption from the feces. That can result in hard and dry stool and constipation for some patients. [2]
Partial agonists, like the anti-diarrhea drug loperamide and antagonists, like naloxegol for opioid-induced constipation, do not cross the blood–brain barrier, but can displace other opioids from binding to those receptors in the myenteric plexus. Because opioids are addictive and may result in fatal overdose, most are controlled substances.
This is the first class of non-opioid pain medication approved to treat moderate to severe acute pain by the FDA in more than 20 years. MORE: Opioids are no better than a placebo for back pain: Study
Oxycodone has low affinity for the δ-opioid receptor (DOR) and the κ-opioid receptor (KOR), where it is an agonist similarly. [ 40 ] [ 41 ] After oxycodone binds to the MOR, a G protein -complex is released, which inhibits the release of neurotransmitters by the cell by decreasing the amount of cAMP produced, closing calcium channels , and ...
Naldemedine, sold under the brand name Symproic in the US and Rizmoic in the European Union, is a medication that is used for the treatment of opioid-induced constipation in adults who have previously been treated with a laxative in the European Union, or to treat opioid induced constipation in adults with chronic non-cancer pain in the US.