ENTEREG vs RELISTOR

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 21, 2026·How we rate

Possible drug interaction. ENTEREG and RELISTOR are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

Attribute	ENTEREG	RELISTOR
Rating	72/100	New
Pharmacy pays	—	—
Type	RX	RX
Active ingredient	ALVIMOPAN	METHYLNALTREXONE BROMIDE
Manufacturer	Cubist Pharms LLC	Salix
Dosage forms	Capsule	Injectable, Tablet
Drug class	Opioid Antagonist	Opioid Antagonist
Boxed warning	None	None
Treats	—	Constipation

entereg relistor

Rating

72/100

New

Pharmacy pays

—

Type

Active ingredient

ALVIMOPAN

METHYLNALTREXONE BROMIDE

Manufacturer

Cubist Pharms LLC

Salix

Dosage forms

Capsule

Injectable, Tablet

Drug class

Opioid Antagonist

Boxed warning

None

Treats

—

Constipation

Frequently asked questions

What is the difference between Entereg and Relistor?

Entereg contains Alvimopan, while Relistor contains Methylnaltrexone Bromide — they have different active ingredients.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.