POSFREA vs ZUPLENZ

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated June 30, 2026·How we rate

Possible drug interaction. POSFREA and ZUPLENZ 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	POSFREA	ZUPLENZ
Rating	New	New
Pharmacy pays	—	$0.15 /mL
Type	RX	RX
Active ingredient	PALONOSETRON HYDROCHLORIDE	ONDANSETRON
Manufacturer	Avyxa Holdings	Aquestive
Dosage forms	Injectable	Film
Drug class	Serotonin-3 Receptor Antagonist	Serotonin-3 Receptor Antagonist
Boxed warning	None	None
Half-life	—	about 3 to 5 hours (roughly 4 hours) in healthy adults
Treats	—	Alcoholism

posfrea zuplenz

Rating

New

Pharmacy pays

—

$0.15 /mL

Type

Active ingredient

PALONOSETRON HYDROCHLORIDE

ONDANSETRON

Manufacturer

Avyxa Holdings

Aquestive

Dosage forms

Injectable

Film

Drug class

Serotonin-3 Receptor Antagonist

Boxed warning

None

Half-life

—

about 3 to 5 hours (roughly 4 hours) in healthy adults

Treats

—

Alcoholism

Frequently asked questions

What is the difference between Posfrea and Zuplenz?

Posfrea contains Palonosetron Hydrochloride, while Zuplenz contains Ondansetron — 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.