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GastroGard Rx

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Product Overview

How To Use

What’s in it?



Questions & Answers

Product Description

GastroGard Oral Paste treats and prevents gastric ulcers. With Omeprazole, this medication is orally-administered daily (one time per day for a duration of 4 weeks; 1 tube for each 1,250 pounds).
Syringe tubes are sold individually.

Who is GastroGard for?

For use in foals (4 weeks old and up; 600 pounds or more) and horses.

Why use GastroGard?

GastroGard is an easily-administered oral paste in a syringe. It is useful in treating ulcers in foals or horses.

How does GastroGard work?

GastroGard works right where acid is produced. It offers short-term acid neutralizing activity, either at the barrier of the mucous membranes or in the lumen of the stomach. It works to inhibit the stomach acid-producing proton pump, which blocks gastric acid secretion of any cause.


Boehringer Ingelheim

Active ingredient(s):


How is GastroGard sold?

Individual oral paste syringe tube

What are the side effects of GastroGard?

No known side effects

What special precautions are there?

  • Do not use in horses intended for food use.
  • Only use in healthy foals and horses.
  • Keep out of reach of children.
  • Safety has not been proven for use in lactating or pregnant mares.

What to do if overdose?

Contact your closest emergency pet hospital.

How can I store GastroGard?

Store at 68°F - 77°F (20°C - 25°C). Trips between 59°F - 86°F (15°C - 30°C) are permitted.

Helpful Tips:

A gastroscopy should be performed by a licensed veterinarian to diagnose gastric ulcers prior to starting on this medication.

Pharmacists are standing by to offer Pet Parent counseling regarding prescription medication purchased from Allivet before and after dispensing. Pharmacists on duty are available Monday-Friday, 9:30AM - 5:30PM EST and will be on call Saturday 12:00PM - 4:00PM EST for consultation.


GastroGard (omeprazole) Paste for horses contains 37% w/w omeprazole and is available in an adjustable-dose syringe. Each syringe contains 2.28 g of omeprazole. Syringes are calibrated according to body weight and are available in boxes of 14 units, 28 units or 72 units.
GastroGard Paste for horses is recommended for use in horses and foals 4 weeks of age and older.
For treatment of gastric ulcers, each weight marking on the syringe plunger will deliver sufficient 250 lbs.
For prevention of recurrence of gastric ulcers, each weight marking will deliver sufficient to dose 500 lbs body weight.
To deliver GastroGard Paste at the treatment dose rate set the syringe plunger to the appropriate weight marking according to the horse’s weight in pounds.
To deliver GastroGard Paste at the dose rate to prevent recurrence of ulcers, set the syringe plunger to the weight marking corresponding to half of the horse’s weight in pounds. Make sure the horse’s mouth does not contain food.
1. Remove the cover from the tip of the syringe, and insert the syringe into the horse’s mouth at a space between the teeth.
2. Depress the plunger until stopped by the knurled ring. The dose should be deposited on the back of the tongue or deep into the cheek pouch, once a day for up to28 days. Care should be taken to ensure that the horse consumes the complete dose.
Treated animals should be observed briefly after administration to ensure that part of the dose is not lost or rejected.
If any of the dose is lost, redosing is recommended. After dosing, if the syringe is not completely empty, it may be reused on following days until emptied. Replace the cap after each use.

Main Ingredients


 may be one of the most common conditions a horse can develop, 60 to 90 percent of show and race horses will develop the illness. And horses with a more nervous disposition are bound to have ulcers compared to a calmer and easy going horse. Because there are various causes to equine gastric ulcers we may want to start to understand a little more of how a horse digestive system may work. We as humans stimulate what is called hydrochloric acid when we eat; this is found in our gastric juices to help aid digestion and protect the stomach against the effects of enzymes and acid. The same production is found in horses but unlike humans they do not just develop hydrochloric acid when they eat, but it is constantly being produced. If a horse does not eat, acid builds up in the stomach which will start to irritate the stomach eventually leading to more serious problems.
We can start to understand that frequent small meals are required in order to keep the stomach from being empty and causing a less damaging effect on the horses stomach. Such feedings of roughage, the amount and types can also play a role in preventing the increase of stomach acid. The horse’s chewing produces more saliva and by the horse swallowing the saliva helps neutralize stomach acid. Also certain types of medications that may increase the risk of ulcers may be those containing NSAIDS anti-inflammatory or any other medication that may block the production of prostaglandin E2 also known as PgE2 which is a chemical that decreases the acid production therefore when there is a low amount of PgE2 levels in the stomach there is a higher level of acid which lead to ulcers developing.

You may want to look out for symptoms in order to take the right action towards treating equine gastric ulcers. Symptoms vary between foals and a adult horse. The following symptoms may be a red flag of a problem

  •         COLIC EPISODES
  •         DIARRHEA
  •          TEETH GRINDING
  •          POOR HAIR COAT


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Customer Submitted Questions

amount of omeprazole in 1 tube?

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