Description and Brand Names

Drug information provided by: Micromedex

US Brand Name

  1. Relistor


Methylnaltrexone injection is used to treat constipation caused by pain medicines called opioids (narcotics) in patients with severe illness. This medicine is used when other medicines for constipation (laxatives) have not worked well.

This medicine is available only with your doctor's prescription.

This product is available in the following dosage forms:

  • Solution