BENADRYL PRESERVATIVE FREE vs DIMENHYDRINATE

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 22, 2026·How we rate

Possible drug interaction. BENADRYL PRESERVATIVE FREE and DIMENHYDRINATE 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	BENADRYL PRESERVATIVE FREE	DIMENHYDRINATE
Rating	New	70/100
Pharmacy pays	$0.04 /mL	—
Type	RX	RX
Active ingredient	DIPHENHYDRAMINE HYDROCHLORIDE	DIMENHYDRINATE
Manufacturer	Mcneil Cons	Watson Labs
Dosage forms	Injectable	Injectable, Tablet
Drug class	Histamine-1 Receptor Antagonist	Histamine-1 Receptor Antagonist
Boxed warning	None	None
Treats	Anxiety Disorders, Sleep Initiation and Maintenance Disorders, Motion Sickness	Motion Sickness, Nausea, Vertigo

benadryl preservative free dimenhydrinate

Rating

New

70/100

Pharmacy pays

$0.04 /mL

—

Type

Active ingredient

DIPHENHYDRAMINE HYDROCHLORIDE

DIMENHYDRINATE

Manufacturer

Mcneil Cons

Watson Labs

Dosage forms

Injectable

Injectable, Tablet

Drug class

Histamine-1 Receptor Antagonist

Boxed warning

None

Treats

Anxiety Disorders, Sleep Initiation and Maintenance Disorders, Motion Sickness

Motion Sickness, Nausea, Vertigo

Frequently asked questions

What is the difference between Benadryl Preservative Free and Dimenhydrinate?

Benadryl Preservative Free contains Diphenhydramine Hydrochloride, while Dimenhydrinate contains Dimenhydrinate — 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.