GamrozyneGamrozyne Injectable Solution Gamrozyne is a fast acting, prescription only injectable macrolide antibiotic for the treatment and control of Bovine Respiratory Disease (BRD) in beef and non lactating dairy cattle. It is the first and only bioequivalent to Zactran (gamithromycin) approved in the U. S., offering veterinarians and producers a reliable, cost effective treatment option. Key Benefits Rapid onset: Reaches target lung tissue within