POSFREA vs ZOFRAN PRESERVATIVE FREE

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 20, 2026·How we rate

Possible drug interaction. POSFREA and ZOFRAN PRESERVATIVE FREE 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	ZOFRAN PRESERVATIVE FREE
Rating	New	68/100
Pharmacy pays	—	$0.15 /mL
Type	RX	RX
Active ingredient	PALONOSETRON HYDROCHLORIDE	ONDANSETRON HYDROCHLORIDE
Manufacturer	Avyxa Holdings	Sandoz
Dosage forms	Injectable	Injectable
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 zofran preservative free

Rating

New

68/100

Pharmacy pays

—

$0.15 /mL

Type

Active ingredient

PALONOSETRON HYDROCHLORIDE

ONDANSETRON HYDROCHLORIDE

Manufacturer

Avyxa Holdings

Sandoz

Dosage forms

Injectable

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 Zofran Preservative Free?

Posfrea contains Palonosetron Hydrochloride, while Zofran Preservative Free contains Ondansetron 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.