ALLEGRA vs PATADAY ONCE DAILY RELIEF

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated June 7, 2026·How we rate

Attribute	ALLEGRA	PATADAY ONCE DAILY RELIEF
Rating	New	New
Pharmacy pays	~$7.33 /30	$1.23 /g
Type	RX	OTC
Active ingredient	FEXOFENADINE HYDROCHLORIDE	OLOPATADINE HYDROCHLORIDE
Manufacturer	Chattem Sanofi	Alcon
Dosage forms	Suspension, Capsule	Solution
Drug class	Histamine-1 Receptor Antagonist	Histamine-1 Receptor Antagonist
Boxed warning	None	None
Half-life	about 14 hours (label: mean elimination half-life 14.4 hours)	—
Treats	Perennial Allergic Rhinitis, Urticaria	Allergic Conjunctivitis

allegra pataday once daily relief

Rating

New

Pharmacy pays

~$7.33 /30

$1.23 /g

Type

OTC

Active ingredient

FEXOFENADINE HYDROCHLORIDE

OLOPATADINE HYDROCHLORIDE

Manufacturer

Chattem Sanofi

Alcon

Dosage forms

Suspension, Capsule

Solution

Drug class

Histamine-1 Receptor Antagonist

Boxed warning

None

Half-life

about 14 hours (label: mean elimination half-life 14.4 hours)

—

Treats

Perennial Allergic Rhinitis, Urticaria

Allergic Conjunctivitis

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Frequently asked questions

What is the difference between Allegra and Pataday Once Daily Relief?

Allegra contains Fexofenadine Hydrochloride, while Pataday Once Daily Relief contains Olopatadine 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.