VIVITROL vs ZIMHI

Independent side-by-side comparison.

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

Possible drug interaction. VIVITROL and ZIMHI 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	VIVITROL	ZIMHI
Rating	70/100	New
Pharmacy pays	~$36.35 /30	$4.41 /mL
Type	RX	RX
Active ingredient	NALTREXONE	NALOXONE HYDROCHLORIDE
Manufacturer	Alkermes Inc	Zmi Pharma
Dosage forms	Kit	Injectable
Drug class	Opioid Antagonist	Opioid Antagonist
Boxed warning	None	None
Half-life	—	30 to 81 minutes (mean 64 ± 12 minutes)
Treats	Alcoholism, Opioid-Related Disorders, Drug Overdose	Opioid-Related Disorders, Respiration Disorders, Septic Shock

vivitrol zimhi

Rating

70/100

New

Pharmacy pays

~$36.35 /30

$4.41 /mL

Type

Active ingredient

NALTREXONE

NALOXONE HYDROCHLORIDE

Manufacturer

Alkermes Inc

Zmi Pharma

Dosage forms

Kit

Injectable

Drug class

Opioid Antagonist

Boxed warning

None

Half-life

—

30 to 81 minutes (mean 64 ± 12 minutes)

Treats

Alcoholism, Opioid-Related Disorders, Drug Overdose

Opioid-Related Disorders, Respiration Disorders, Septic Shock

Frequently asked questions

What is the difference between Vivitrol and Zimhi?

Vivitrol contains Naltrexone, while Zimhi contains Naloxone 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.