Gamithromycin
Gamithromycin is a semi-synthetic macrolide antibiotic developed for veterinary use, primarily administered to cattle and swine for the treatment of bacterial respiratory infections. It is not approved for human use and is typically administered as a single subcutaneous injection.
Veterinary macrolide antibiotic used to treat respiratory infections in livestock animals.
Key facts at a glance
- RxNorm
- 1113697
- Generic
- Gamithromycin
- Class
- unclassified
- Brands
- Zactran, Gamrozyne
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- solution
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Primarily used in cattle and swine for the treatment and control of bovine respiratory disease (BRD) associated with Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, and Mycoplasma bovis, as well as swine respiratory disease complex.
As a macrolide antibiotic, gamithromycin binds to the 50S ribosomal subunit of susceptible bacteria, inhibiting protein synthesis. It has bacteriostatic activity against susceptible organisms, though may exhibit bactericidal effects at higher concentrations.
For veterinary use only in food-producing animals. Meat withdrawal times must be observed before slaughter. Administered as a single injection. May cause injection site reactions. Not approved for use in humans. Susceptibility testing recommended when possible.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 31, 2026. · Read our editorial policy