NAFCILLIN SODIUM vs PENBRITIN-S

Independent side-by-side comparison.

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

Possible drug interaction. NAFCILLIN SODIUM and PENBRITIN-S 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	NAFCILLIN SODIUM	PENBRITIN-S
Rating	New	New
Pharmacy pays	—	~$13.42 /30
Type	RX	RX
Active ingredient	NAFCILLIN SODIUM	AMPICILLIN SODIUM
Manufacturer	Fresenius	Wyeth Ayerst
Dosage forms	Injectable	Injectable
Drug class	Penicillin-Class Antibacterial	Penicillin-Class Antibacterial
Boxed warning	None	None
Treats	Cellulitis, Bacterial Endocarditis, Osteomyelitis	Actinomycosis, Human Bites, Bacillary Dysentery

nafcillin sodium penbritin-s

Rating

New

Pharmacy pays

—

~$13.42 /30

Type

Active ingredient

NAFCILLIN SODIUM

AMPICILLIN SODIUM

Manufacturer

Fresenius

Wyeth Ayerst

Dosage forms

Injectable

Drug class

Penicillin-Class Antibacterial

Boxed warning

None

Treats

Cellulitis, Bacterial Endocarditis, Osteomyelitis

Actinomycosis, Human Bites, Bacillary Dysentery

Frequently asked questions

What is the difference between Nafcillin Sodium and Penbritin-S?

Nafcillin Sodium contains Nafcillin Sodium, while Penbritin-S contains Ampicillin Sodium — 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.