CAYSTON vs GEOPEN

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 20, 2026·How we rate

Possible drug interaction. CAYSTON and GEOPEN 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	CAYSTON	GEOPEN
Rating	70/100	New
Pharmacy pays	—	—
Type	RX	RX
Active ingredient	AZTREONAM	CARBENICILLIN DISODIUM
Manufacturer	Gilead Sciences Inc	Roerig
Dosage forms	Kit	Injectable
Drug class	—	—
Boxed warning	None	None
Treats	Cellulitis, Endometritis, Pseudomonas Infections	Prostatitis, Urinary Tract Infections, Gram-Negative Bacterial Infections

cayston geopen

Rating

70/100

New

Pharmacy pays

—

Type

Active ingredient

AZTREONAM

CARBENICILLIN DISODIUM

Manufacturer

Gilead Sciences Inc

Roerig

Dosage forms

Kit

Injectable

Drug class

—

Boxed warning

None

Treats

Cellulitis, Endometritis, Pseudomonas Infections

Prostatitis, Urinary Tract Infections, Gram-Negative Bacterial Infections

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Frequently asked questions

What is the difference between Cayston and Geopen?

Cayston contains Aztreonam, while Geopen contains Carbenicillin Disodium — 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.