CAYSTON vs COLY-MYCIN M

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated October 8, 2026·How we rate

Possible drug interaction. CAYSTON and COLY-MYCIN M 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	COLY-MYCIN M
Rating	72/100	New
Pharmacy pays	—	~$464.60 /30
Type	RX	RX
Active ingredient	AZTREONAM	COLISTIMETHATE SODIUM
Manufacturer	Gilead Sciences Inc	Ph Health
Dosage forms	Kit	Injectable
Drug class	—	Polymyxin-Class Antibacterial
Boxed warning	None	None
Treats	Cellulitis, Endometritis, Pseudomonas Infections	Escherichia Coli Infections, Klebsiella Infections, Pseudomonas Infections

cayston coly-mycin m

Rating

72/100

New

Pharmacy pays

—

~$464.60 /30

Type

Active ingredient

AZTREONAM

COLISTIMETHATE SODIUM

Manufacturer

Gilead Sciences Inc

Ph Health

Dosage forms

Kit

Injectable

Drug class

—

Polymyxin-Class Antibacterial

Boxed warning

None

Treats

Cellulitis, Endometritis, Pseudomonas Infections

Escherichia Coli Infections, Klebsiella Infections, Pseudomonas Infections

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Frequently asked questions

What is the difference between Cayston and Coly-Mycin M?

Cayston contains Aztreonam, while Coly-Mycin M contains Colistimethate 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.