PENBRITIN vs PRINCIPEN '500'

Independent side-by-side comparison.

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

Attribute	PENBRITIN	PRINCIPEN '500'
Rating	New	New
Pharmacy pays	—	—
Type	RX	RX
Active ingredient	AMPICILLIN/AMPICILLIN TRIHYDRATE	AMPICILLIN/AMPICILLIN TRIHYDRATE
Manufacturer	Wyeth Ayerst	Apothecon
Dosage forms	Capsule	Capsule
Drug class	—	—
Boxed warning	None	None

penbritin principen '500'

Rating

New

Pharmacy pays

—

Type

Active ingredient

AMPICILLIN/AMPICILLIN TRIHYDRATE

Manufacturer

Wyeth Ayerst

Apothecon

Dosage forms

Capsule

Drug class

—

Boxed warning

None

Frequently asked questions

What is the difference between Penbritin and Principen '500'?

Both Penbritin and Principen '500' share the active ingredient Ampicillin/Ampicillin Trihydrate.

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.