Benadryl Allergy Ultratab (Diphenhydramine 25mg)
Benadryl·$12.99
✓Generic Worth ItSave 31%
70% confidence371 votes
✓Verified Apr 2026
Generic Alternative
Kirkland Signature Allergy Medicine (Diphenhydramine 25mg)
Kirkland Signature
Costco
$8.99
260
Same Quality
74
Close Enough
37
Not Worth It
Quick Facts
✓Ingredients ComparedConfirmed
Sign in to vote on this comparison.
70%
Same Quality
20%
Close Enough
10%
Not Worth It
Evidence (1)
Ingredients✓ Confirmedby adminApr 6, 2026
Kirkland Signature Allergy Medicine contains diphenhydramine 25mg, identical to Benadryl Allergy. Diphenhydramine is an off-patent drug; FDA-approved generics are required to be bioequivalent. Manufactured by Perrigo. One of the best-known examples of overpaying for a name brand.
Add Evidence
Sign in to contribute evidence on this comparison.