CAYSTON vs VELOSEF '500'

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated October 10, 2026·How we rate

Possible drug interaction. CAYSTON and VELOSEF '500' 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	VELOSEF '500'
Rating	72/100	New
Pharmacy pays	—	—
Type	RX	RX
Active ingredient	AZTREONAM	CEPHRADINE
Manufacturer	Gilead Sciences Inc	Ersana
Dosage forms	Kit	Capsule
Drug class	—	—
Boxed warning	None	None
Treats	Cellulitis, Endometritis, Pseudomonas Infections	Escherichia Coli Infections, Klebsiella Infections, Proteus Infections

cayston velosef '500'

Rating

72/100

New

Pharmacy pays

—

Type

Active ingredient

AZTREONAM

CEPHRADINE

Manufacturer

Gilead Sciences Inc

Ersana

Dosage forms

Kit

Capsule

Drug class

—

Boxed warning

None

Treats

Cellulitis, Endometritis, Pseudomonas Infections

Escherichia Coli Infections, Klebsiella Infections, Proteus Infections

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Frequently asked questions

What is the difference between Cayston and Velosef '500'?

Cayston contains Aztreonam, while Velosef '500' contains Cephradine — 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.