What development phase is Zactran in?

Zactran is FDA-approved (marketed).

What are the side effects of Zactran?

Common side effects include Injection site swelling, Transient animal discomfort.

What is the generic name of Zactran?

GAMITHROMYCIN is the generic (nonproprietary) name of Zactran.

Last reviewed 2026-04-20 · How we verify

Zactran (GAMITHROMYCIN)

FDA-approved active Small molecule Quality 6/100

Gamithromycin (Zactran) is a marketed antibiotic that inhibits bacterial protein synthesis, currently holding a position in the veterinary pharmaceutical market. A key strength of Zactran is its mechanism of action, which effectively targets bacterial protein synthesis, providing a robust therapeutic option. The primary risk is the expiration of the key composition patent in 2028, which could lead to increased competition from generics.

At a glance

Generic name	GAMITHROMYCIN
Modality	Small molecule
Therapeutic area	Infectious Disease
Phase	FDA-approved

Approved indications

No approved indications tracked.

Common side effects

Injection site swelling
Transient animal discomfort