Green and yellow Gastrogard packaging with an injector Green and yellow Gastrogard packaging with an injector

GASTROGARD® (omeprazole)

Just Because You Can’t See Stress, Doesn’t Mean It’s Not There

Any horse can develop equine gastric ulcer syndrome (EGUS), and the leading risk factors are episodic feeding practices and stress. Horses with EGUS may show subtle changes in behavior or more obvious clinical signs, such as poor performance, weight loss and decreased appetite. And EGUS doesn’t just affect your horse’s quality of life, it can impact your ability to enjoy your relationship with them. If gastric ulcers are diagnosed, GASTROGARD paste has been trusted by veterinarians and horse owners like you to help treat and heal ulcers.

If you suspect ulcers, talk to your veterinarian about scheduling a gastroscopy exam. 

Learn More About Gastric Health

Top Reasons to Choose GASTROGARD

GASTROGARD effectively strikes back against EGUS, to enable you and your horse to get back to enjoying the time you spend together. If gastric ulcers are diagnosed, ask your veterinarian if a GASTROGARD prescription is right for your horse.

Before and after images showing healing of gastric ulcers in a horse treated with GASTROGARD. Before and after images showing healing of gastric ulcers in a horse treated with GASTROGARD.

Proven Efficacy

GASTROGARD has been proven to heal or significantly improve gastric ulcers by up to 99%.1

Women leading a horse Women leading a horse

Not All Omeprazoles Are the Same

Compounded omeprazole and other products not approved by the FDA may appear to reduce signs, but may not fully heal ulcers.

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Veterinarian Recommended

GASTROGARD is recommended by 95% of veterinarians,2 and has been trusted for 25 years to deliver treatment success.

Al Dunning's Go-To Solution for Equine Ulcer Treatment

Renowned NCHA Hall of Fame Rider Al Dunning shares how GASTROGARD helped his horse, Donut, recover from severe gastric ulcers. Watch as he and Dr. Jerry Longworth discuss the importance of ulcer treatment for overall horse health.

Make Your Gastric Health Plan

You are your horse’s first line of defense against the pain and discomfort of gastric ulcers. Sometimes ulcers cannot be avoided, and treatment is required. Beyond treating ulcers, you can support your horse’s ongoing gastric health with management and prevention practices.

A vet giving a horse Gastrogard orally A vet giving a horse Gastrogard orally

Treat With GASTROGARD

If you suspect your horse is suffering from gastric ulcers, talk to your veterinarian. If diagnosed, strike back with GASTROGARD.

Horse entering trailer Horse entering trailer

Prevent Gastric Ulcers

Identify and anticipate moments of stress, and talk to your veterinarian about the omeprazole dosing that will work best for your horse’s needs.

A women filling a feed basket for a horse with hay in a barn A women filling a feed basket for a horse with hay in a barn

Manage Gastric Health Daily

Reduce your horse’s risk of ulcers by minimizing stress, providing hay free choice, adding alfalfa and feeding hay before concentrate.

Additional Product Information

Dosage & Administration

GASTROGARD is a prescription medication available from your veterinarian. Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. 

GASTROGARD paste for horses is recommended for use in horses and foals 4 weeks of age and older. The contents of one syringe will dose a 1,250-lb (568 kg) horse at a rate of 1.8 mg omeprazole/lb of body weight (4 mg/kg). For treatment of gastric ulcers, each weight-marking on the syringe plunger will deliver sufficient omeprazole to treat 250 lbs (114 kg) of body weight. For prevention of recurrence of gastric ulcers, each weight-marking will deliver sufficient omeprazole to dose 500 lbs (227 kg) of body weight at the rate of 0.9 mg omeprazole/lb of body weight (2 mg/kg). 

For more information, please read GASTROGARD product information. 

Resources

EGUS Educational Brochure

GASTROGARD Brochure

GASTROGARD Prescribing Information

Safety

The safety of GASTROGARD paste has not been determined in pregnant or lactating mares. For use in horses and foals 4 weeks of age and older. Keep this and all drugs out of the reach of children. In case of ingestion, contact a physician. Caution: Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian.  

Store at 68–77°F (20—25°C). Excursions between 59–86°F (15—30°C) are permitted. 

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References

1 GASTROGARD product label.

2 Kynetec. Market evaluation summary—GASTROGARD. 2021.

 

GASTROGARD® is a registered trademark of Boehringer Ingelheim Animal Health USA Inc. ©2025 Boehringer Ingelheim Animal Health USA Inc., Duluth, GA. All rights reserved. US-EQU-0108-2024 

IMPORTANT SAFETY INFORMATION: The safety of GASTROGARD paste has not been determined in pregnant or lactating mares. For use in horses and foals 4 weeks of age or older. Keep this and all drugs out of the reach of children. In case of ingestion, contact a physician. Caution: Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian.