Tri-Hist Granules 20oz - Rx

Brand Varies - Tri-Hist® Granules is an antihistamine and decongestant powder for horses.


For use in horses when a histamine antagonizing preparation is required. Helps alleviate skin and respiratory allergies such as congestion, hives (urticaria), runny nose, and itching.

Species: Horses


Respiratory congestion can result from a number of causes, including cold and flu viruses, allergens, and non-infectious irritants. Regardless of the specific cause, an antihistamine can provide immediate relief and reduce the downtime due to illness.

Histamines are the body's natural response to allergens and are responsible for the symptoms seen, including itchiness and runny nose. Antihistamines alone do not relieve these symptoms, but block further histamines from binding.

Decongestants help by relieving the symptoms already present, opening the airway and helping the horse breathe.


Highly palatable cornmeal base

Easy to administer

Made in the USA

For equine use only. 

Not for use in horses intended for food. 

Do not use within 72 hours of sporting events. 

Store at room temperature between 59 and 86 °F.


1/2 ounce (1 level tablespoon) per 1,000 lb bodyweight, or as recommended by a veterinarian. Can be mixed with feed and repeated at 12-hour intervals if needed. Give as needed.

May be easily administered by mixing with feed, and provide horse with ample drinking water.


Data sheet

* Prescription Required

Specific References

related products