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RELENZA vs TAMIFLU

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 21, 2026·How we rate

Possible drug interaction. RELENZA and TAMIFLU 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.

Rating

70/100
New

Pharmacy pays

$0.15 /mL

Type

RX
RX

Active ingredient

ZANAMIVIR
OSELTAMIVIR PHOSPHATE

Dosage forms

Powder
Capsule, Powder

Drug class

Neuraminidase Inhibitor

Boxed warning

None
None

Half-life

about 1 to 3 hours

Treats

Human Influenza
Human Influenza

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Frequently asked questions

What is the difference between Relenza and Tamiflu?

Relenza contains Zanamivir, while Tamiflu contains Oseltamivir Phosphate — 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.