Relistor Side Effects
Generic name: methylnaltrexone
Medically reviewed by Drugs.com. Last updated on Dec 24, 2022.
Note: This document contains side effect information about methylnaltrexone. Some dosage forms listed on this page may not apply to the brand name Relistor.
Applies to methylnaltrexone: oral tablet. Other dosage forms:
Serious side effects of Relistor
Along with its needed effects, methylnaltrexone (the active ingredient contained in Relistor) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking methylnaltrexone:
Incidence not known
- fear or nervousness
- increased sweating
- severe abdominal or stomach pain
- severe or persistent diarrhea
Other side effects of Relistor
Some side effects of methylnaltrexone may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.
Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Full or bloated feeling
- muscle spasms
- pressure in the stomach
- runny nose
- swelling of the abdominal or stomach area
For Healthcare Professionals
Applies to methylnaltrexone: oral tablet, subcutaneous kit, subcutaneous solution.
Very common (10% or more): Abdominal pain (up to 29%), flatulence (up to 13%), nausea (up to 12%)
Common (1% to 10%): Diarrhea,
Postmarketing reports: Perforation, cramping, vomiting[Ref]
Common (1% to 10%): Dizziness, tremor[Ref]
Common (1% to 10%): Hyperhidrosis, flushing[Ref]
Common (1% to 10%): Chills
Postmarketing reports: Malaise, pain, cases of opioid withdrawal[Ref]
In an open-label, uncontrolled study (n=1034), 4 myocardial infarctions (1 fatal), 1 stroke (fatal), 1 fatal cardiac arrest, and 1 sudden death were reported. It is not possible to establish a relationship between these events and use of this drug.[Ref]
Frequency not reported: Myocardial infarctions[Ref]
The most common adverse reactions included abdominal pain, nausea, diarrhea, hyperhidrosis, hot flush, tremor, and chills.[Ref]
Common (1% to 10%): Injection site reactions including stinging, burning, pain, redness, and edema[Ref]
More about Relistor (methylnaltrexone)
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Related treatment guides
1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
2. Cerner Multum, Inc. "Australian Product Information." O 0
3. "Product Information. Relistor (methylnaltrexone)." Wyeth Laboratories (2008):
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Some side effects may not be reported. You may report them to the FDA.