Zeranol
Ralgro (zeranol) is a brand-name veterinary medication used as a growth promoter in cattle. It belongs to a class of compounds known as non-steroidal estrogens and has been utilized in the beef industry to improve feed efficiency and promote weight gain in livestock. This medication is not intended for human use.
Ralgro is a veterinary growth promoter used in cattle to enhance weight gain and feed efficiency.
Key facts at a glance
- RxNorm
- 1368481
- Generic
- Ralgro
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- 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.
Ralgro is used as a growth-promoting implant in beef cattle to improve feed efficiency and accelerate weight gain during the finishing phase before slaughter. It is specifically indicated for use in cattle to increase rate of weight gain and improve feed conversion.
The specific mechanism of action is not clearly specified. As a non-steroidal estrogenic compound, it is believed to act as an estrogen agonist, affecting growth regulation and metabolism in cattle. It promotes muscle growth and improves nutrient utilization in treated animals.
Ralgro is approved exclusively for veterinary use in beef cattle and is not intended for human administration. It is administered as a subcutaneous implant, typically in the ear. Proper withdrawal times must be observed before slaughter to ensure food safety. This medication requires veterinary prescription and should only be used as directed for approved livestock species.
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 9, 2026. · Read our editorial policy