RELISTOR vs VIVITROL

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 22, 2026·How we rate

Possible drug interaction. RELISTOR and VIVITROL 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	RELISTOR	VIVITROL
Rating	New	70/100
Pharmacy pays	—	~$36.35 /30
Type	RX	RX
Active ingredient	METHYLNALTREXONE BROMIDE	NALTREXONE
Manufacturer	Salix	Alkermes Inc
Dosage forms	Injectable, Tablet	Kit
Drug class	Opioid Antagonist	Opioid Antagonist
Boxed warning	None	None
Treats	Constipation	Alcoholism, Opioid-Related Disorders, Drug Overdose

relistor vivitrol

Rating

New

70/100

Pharmacy pays

—

~$36.35 /30

Type

Active ingredient

METHYLNALTREXONE BROMIDE

NALTREXONE

Manufacturer

Salix

Alkermes Inc

Dosage forms

Injectable, Tablet

Kit

Drug class

Opioid Antagonist

Boxed warning

None

Treats

Constipation

Alcoholism, Opioid-Related Disorders, Drug Overdose

Frequently asked questions

What is the difference between Relistor and Vivitrol?

Relistor contains Methylnaltrexone Bromide, while Vivitrol contains Naltrexone — 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.