ENTEREG vs OPVEE

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 12, 2026·How we rate

Possible drug interaction. ENTEREG and OPVEE 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	OPVEE
Rating	72/100	New
Pharmacy pays	—	—
Type	RX	RX
Active ingredient	ALVIMOPAN	NALMEFENE HYDROCHLORIDE
Manufacturer	Cubist Pharms LLC	Indivior
Dosage forms	Capsule	Spray/Inhaler
Drug class	Opioid Antagonist	Opioid Antagonist
Boxed warning	None	None
Treats	—	Opioid-Related Disorders, Respiration Disorders, Drug Overdose

entereg opvee

Rating

72/100

New

Pharmacy pays

—

Type

Active ingredient

ALVIMOPAN

NALMEFENE HYDROCHLORIDE

Manufacturer

Cubist Pharms LLC

Indivior

Dosage forms

Capsule

Spray/Inhaler

Drug class

Opioid Antagonist

Boxed warning

None

Treats

—

Opioid-Related Disorders, Respiration Disorders, Drug Overdose

Frequently asked questions

What is the difference between Entereg and Opvee?

Entereg contains Alvimopan, while Opvee contains Nalmefene Hydrochloride — 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.