What is methylnaltrexone bromide?

Methylnaltrexone bromide treats constipation triggered by opioids, or narcotic drugs. It can be used by people in the advanced stages of illness who have not responded to laxatives. Methylnaltrexone works by blocking the constipation effect without reducing the medicine's pain-relieving qualities. Methylnaltrexone bromide is an injectable solution. It is available by prescription only, sold under the brand name Relistor.

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