GastroGard vs. UlcerGard: Understanding Your Equine Ulcer Medication Options
If you’re a horse owner, you’ve likely likely encountered the confusing world of equine ulcer medications. With multiple products on the market and varying price points, it’s easy to assume that different products must contain different ingredients or strengths.
However, when it comes to the two FDA-approved equine ulcer medications, the reality might surprise you. Understanding the truth about these medications could save you money while ensuring your horse receives effective treatment.
Equine Gastric Ulcer Syndrome (EGUS) is one of the most common health conditions affecting horses today. Studies have shown that the prevalence of gastric ulcers in racehorses ranges from 60 to 90 percent, and even non-performance horses can be significantly affected.
These statistics underscore the importance of understanding your treatment options and choosing medications that will genuinely help your horse heal rather than wasting time and money on ineffective alternatives.
Understanding Equine Gastric Ulcer Syndrome
Equine Gastric Ulcer Syndrome is an umbrella term used to describe erosions, ulcerations, and lesions in the horse;s stomach. The condition has been recognized since 1999 and represents a significant health concern for horse owners and veterinarians alike. Horses are particularly susceptible to gastric ulcers due to their unique anatomy and digestive physiology, which includes continuous acid production regardless of feed intake.
The clinical signs associated with EGUS are often vague, which can make diagnosis challenging. Horses with gastric ulcers may show poor appetite, mild colic, discomfort during girthing, behavioral changes, decreased performance, and weight loss.
However, it’s important to note that many horses with ulcers show no external clinical signs at all, which is why gastroscopy remains the gold standard for diagnosis.
The correlation between exercise and ulcer development is particularly strong, as intense training increases acid exposure in the upper portion of the stomach.
The Two FDA-Approved Equine Ulcer Medications
There are only two FDA-approved medications for treating or preventing gastric ulcers in horses: GastroGard and UlcerGard.
Both products are manufactured by the same company (now part of Boehringer Ingelheim) and contain the exact same active ingredient at the exact same concentration. Specifically, both products contain omeprazole at 2.28 grams per tube of oral paste. The distinction between them is purely regulatory, based on how they are labeled and marketed rather than any difference in potency or composition.
GastroGard: Treatment of Existing Ulcers
GastroGard is FDA-approved for the treatment of existing gastric ulcers in horses and foals four weeks of age and older.
Clinical studies have demonstrated that GastroGard heals or significantly improves equine gastric ulcers by up to 99 percent when used according to label directions.
The treatment protocol typically involves administering one full tube once daily for 28 days, followed by a maintenance period if needed.
This product represents the gold standard for ulcer treatment because its efficacy has been rigorously proven through controlled clinical trials.
UlcerGard: Prevention of Ulcer Formation
UlcerGard is FDA-approved for the prevention of gastric ulcer formation in horses. It is the only FDA-approved product specifically labeled for ulcer prevention. Research has shown that omeprazole given at lower doses effectively prevents the formation of gastric ulcers in ulcer-free horses.
The preventive dosing regimen typically involves administering the product during periods of stress, such as competition, travel, or changes in management routine.
One dose provides 24 hours of protection, making it convenient for ongoing prevention protocols.
Treatment vs. Prevention: A Regulatory Distinction
The critical point to understand is that GastroGard and UlcerGard are identical products with different labels. They contain the same drug at the same dose.
The difference lies entirely in how they are allowed to be marketed based on their FDA approvals. GastroGard underwent clinical trials to prove efficacy in healing existing ulcers, while UlcerGards trials focused on preventing ulcer formation.
This regulatory distinction determines what claims the manufacturer can make, not what the product actually contains or how powerful it is.
This has significant practical implications for horse owners. When your veterinarian prescribes treatment for confirmed ulcers, GastroGard is the appropriate labeled product.
For horses at risk of developing ulcers but without current lesions, UlcerGard provides the same medication with appropriate labeling for prevention.
Understanding this distinction can help you have informed conversations with your veterinarian about the most cost-effective approach for your horses specific situation.
How Omeprazole Works
Omeprazole belongs to a class of medications called proton pump inhibitors (PPIs).
It works by blocking the H+/K+-ATPase enzyme system in the parietal cells of the stomach, which is the final step in gastric acid production.
By inhibiting this proton pump, omeprazole effectively shuts down acid secretion at its source. Research has shown that at appropriate doses, omeprazole can inhibit gastric acid secretion by up to 99 percent, creating an environment where damaged stomach lining can heal.
This mechanism is fundamentally different from antacids or H2 blockers, providing more complete and longer-lasting acid suppression.
The proton pump inhibition is essentially irreversible, with acid secretion only returning as new proton pumps are synthesized by the parietal cells. This means that once-daily dosing provides continuous acid suppression throughout the 24-hour period, which is essential for ulcer healing.
Why Enteric Coating Matters
One of the most critical aspects of omeprazole formulation that is often overlooked is the enteric coating.
Omeprazole is rapidly degraded by exposure to stomach acid. Without proper protection, the medication is destroyed before it can be absorbed and reach its site of action.
This is where many cheaper, non-FDA-approved products fail catastrophically.
Enteric coating serves as a protective barrier that prevents the medication from dissolving in the acidic environment of the stomach. Instead, the coating allows the medication to pass through to the small intestine, where the higher pH triggers release and absorption can occur.
Studies have shown that even slight deficiencies in enteric coating can result in dramatically reduced efficacy. An ideal enteric coating for omeprazole must remain intact in the acidic gastric environment and then release the drug appropriately in the higher pH environment of the small intestine.
GastroGard and UlcerGard utilize a specially formulated enteric coating system that has been proven effective through rigorous testing. The coating technology ensures that the medication survives the harsh acidic environment of the stomach and is delivered intact to the intestine where it can be properly absorbed.
This sophisticated formulation is a key reason why these products work reliably while many alternatives do not.
The Problem with Compounded and Non-FDA-Approved Products
The market is flooded with compounded and non-FDA-approved omeprazole products that claim to offer the same benefits at a lower price.
However, scientific research has repeatedly demonstrated serious problems with many of these alternatives. A landmark study conducted at the University of California, Davis, found that compounded omeprazole products are not effective in treating equine gastric ulcers.
This isn’t a matter of minor differences inefficacy—the study showed that many compounded products simply fail to work.
Documented Problems with Compounded Products
Research has revealed multiple serious issues with compounded and non-approvedomeprazole products:
• Potency issues: Studies have documented that some compounded omeprazole products contain as little as 36 percent of the labeled drug amount.
One analysis found omeprazole powder at only 78 percent of the label-claimed potency.
• Rapid degradation: Without proper formulation, omeprazole degrades quickly.
Compounded products often lack adequate buffering systems or enteric coating, leading to rapid loss of potency.
• Inadequate enteric coating: Many cheaper products either lack enteric coating entirely or use inferior coating that dissolves prematurely in stomach acid, destroying the medication before it can work.
• Poor formulation stability: Research on compounded omeprazole suspensions has shown that without proper formulation, the drug can degrade significantly even within short time periods.
The consequences of these formulation problems are serious.
Horse owners may spend weeks or months treating their horses with products that appear less expensive but ultimately fail to heal the ulcers.
This leads to treatment failure, continued suffering for the horse, and the frustration of “it didn’t work” scenarios. In some cases, owners may mistakenly conclude that omeprazole itself doesn’t work for their horse, when in fact they were using a product that never contained adequate medication in a bioavailable form.
Why FDA Approval Matters
FDA approval represents far more than just a regulatory checkbox.
For a medication to receive FDA approval, it must undergo rigorous testing to prove three critical things: safety, efficacy, and potency.
The approved product must be proven safe for the intended species, effective for the labeled indication, and manufactured to consistently contain the stated amount of active ingredient in a stable, bioavailable formulation.
When you purchase an FDA-approved medication, you have assurance that every tube contains the stated amount of medication, formulated properly to reach its site of action.
The manufacturing process is monitored and controlled, with quality assurance testing that ensures batch-to-batch consistency. The enteric coating system has been validated to protect the medication appropriately.
None of these guarantees exist for compounded or non- approved products, regardless of what the label claims.
The Bottom Line
There are only two FDA-approved equine ulcer medications: GastroGard and UlcerGard.
These products contain the exact same medication at the exact same dose. The only
difference is their labeled indication—GastroGard for treatment, UlcerGard for prevention.
Both have been proven effective through rigorous clinical trials, both contain reliable amounts of properly formulated omeprazole, and both utilize enteric coating technology that ensures the medication reaches its site of action.
Many non-approved products on the market contain far less medication than their labels claim and may not be properly coated. This means they simply don’t work. The apparent cost savings of cheaper products evaporates quickly when you consider that you may be paying for something that provides no therapeutic benefit. Worse, your horse continues to suffer from ulcers that never truly heal.
When it comes to your horses health, choosing proven, FDA-approved medications is the only responsible choice.
The investment in quality medication pays dividends in effective treatment, faster healing, and peace of mind knowing that your horse is receiving medication that actually works.
If you suspect your horse may have gastric ulcers or want to discuss a prevention protocol, contact us today. We can help you develop an appropriate treatment or prevention plan using proven, effective medications that will help your horse feel their best.
Call us or comment below to learn more.
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