Adverse Drug Reaction Classification System

Pharmaceutical Information
Drug Name Methylnaltrexone
Drug ID BADD_D02462
Description Methylnaltrexone is a pheriphally-acting μ-opioid antagonist that acts on the gastrointestinal tract to decrease opioid-induced constipation without producing analgesic effects or withdrawal symptoms. It is also a weak CYP2D6 inhibitor. FDA approved in 2008.
Indications and Usage Treatment of opioids induced constipation in palliative patients that are inadequately responding to laxative therapy.
Marketing Status approved
ATC Code A06AH01
DrugBank ID DB06800
KEGG ID D06618
MeSH ID C032257
PubChem ID 5361918
TTD Drug ID D03YVO
NDC Product Code Not Available
UNII 0RK7M7IABE
Synonyms methylnaltrexone | quaternary ammonium naltrexone | (5alpha)-17-(cyclopropylmethyl)-3,14-dihydroxy-17-methyl-4,5-epoxymorphinan-17-ium-6-one | 17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxymorphinanium-6-one | morphinanium, 17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxy-17-methyl-6-oxo-, (5alpha)- | morphinan-17-ium-6-one, 17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxy-17-methyl-, (5alpha)- | naltrexone methylbromide | N-methylnaltrexone bromide | morphinan-17-ium-6-one, 17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxy-17-methyl-, bromide, (5alpha,17R)- | naltrexone MB | naltrexone methobromide | methylnaltrexone bromide | methyl-naltrexone hydrobromide | MRZ 2663BR | Relistor | MRZ-2663 | naltrexonium methiodide
Chemical Information
Molecular Formula C21H26NO4+
CAS Registry Number 83387-25-1
SMILES C[N+]1(CCC23C4C(=O)CCC2(C1CC5=C3C(=C(C=C5)O)O4)O)CC6CC6
Chemical Structure
ADRs Induced by Drug
*The priority for ADR severity classification is based on FAERS assessment, followed by the most severe level in CTCAE rating. If neither is available, it will be displayed as 'Not available'.
**The 'Not Available' level is hidden by default and can be restored by clicking on the legend twice..
ADR Term ADReCS ID ADR Frequency (FAERS) ADR Severity Grade (FAERS) ADR Severity Grade (CTCAE)
Abdominal pain07.01.05.0020.004391%
Ascites09.01.05.003; 07.07.01.001; 02.05.04.0020.000439%
Constipation07.02.02.0010.003644%
Death08.04.01.0010.013172%
Diarrhoea07.02.01.0010.004171%
Dizziness02.11.04.006; 24.06.02.007; 17.02.05.0030.001712%
Drug ineffective08.06.01.0060.016773%Not Available
Drug withdrawal syndrome08.06.02.004; 19.07.06.0130.001712%Not Available
Flushing24.03.01.002; 23.06.05.003; 08.01.03.0250.000966%
Gastrointestinal perforation07.04.04.0010.000439%Not Available
Injection site pain12.07.03.011; 08.02.03.0100.001493%Not Available
Intestinal perforation07.04.06.0020.000439%Not Available
Large intestine perforation12.02.03.005; 07.04.06.0050.000659%
Mucous stools07.01.03.0060.001712%Not Available
Muscle spasms15.05.03.0040.001186%
Retching07.01.07.0020.000966%Not Available
Tremor17.01.06.0020.001493%
Urticaria23.04.02.001; 10.01.06.0010.001493%
Vomiting07.01.07.0030.003425%
Withdrawal syndrome19.07.06.023; 08.06.02.0120.002986%Not Available
Pneumoperitoneum07.07.01.0080.000439%Not Available
Therapeutic product effect decreased08.06.01.0500.001493%Not Available
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