Medically Reviewed By: Medsdog Team
Last Updated: September 2026
If your furry friend has been diagnosed with acid reflux, gastritis, or a stomach ulcer, your vet may have prescribed dog omeprazole. It is one of the most common drugs used in veterinary medicine to help decrease acid levels in your dog’s body giving your dog’s gastrointestinal tract the opportunity to heal.
You probably know this drug by its human brand name, Prilosec and if you’re holding a bottle of 20 mg tablets wondering exactly how much omeprazole you can give your dog, precision matters. Too little won’t protect the stomach lining; too many increases the risk of side effects.
Therefore, being aware of the safe omeprazole dosage for dogs is essential for every pet owner, so they can use the medicine responsibly and help their canine companion when needed.
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The standard omeprazole dose for dogs is 0.5 to 1 mg per kg of body weight (0.25 to 0.5 mg per lb), given once daily on an empty stomach.
Below you’ll find a weight-based omeprazole dosage chart for dogs & calculator, an interactive calculator, and the safety details vets actually check before approving a dose.
Disclaimer: All information in this guide is provided for educational purposes only and should never replace professional veterinary advice.
Omeprazole For Dogs Dosage Calculator
Estimate an omeprazole dose for acid reflux, gastritis, or stomach ulcers based on your dog’s body weight.
Estimated Omeprazole Dose
0 – 0 mg
per dose, typically given once daily
This calculator provides a general estimate only and is not a substitute for professional veterinary advice. Always confirm dosage and treatment duration with a licensed veterinarian before giving any medication to your dog.
Omeprazole for Dogs Overview
| Drug class | Proton pump inhibitor (PPI) |
| Brand names | Prilosec, GastroGard, Losec |
| Conditions treated | Ulcers, acid reflux (GERD), gastritis, esophagitis, Helicobacter infection |
| Standard canine omeprazole dose | 0.5–1 mg per kg of body weight (≈0.25–0.5 mg per lb), once daily |
| Forms available | Tablets (10 mg, 20 mg), capsules, compounded liquid/paste |
| Time to take effect | 1–5 days for symptom improvement; full acid suppression by day 3–4 |
| Typical duration of use | 2–8 weeks for short-term issues; longer with veterinary monitoring |
| Approx. cost | $19–$30 for 30 tablets (OTC human generic) |
| FDA-approved for dogs? | No — used off-label under veterinary direction |
Key Takeaways
What Is Omeprazole for Dogs Dosage & What Does It Treat?
Omeprazole For Dogs Dosage is what is known as a proton pump inhibitor (PPI). In simple terms, it works by blocking the enzyme of the stomach lining which produces the acid.
By lowering the amount of acid, dos Omeprazole helps to prevent damage to the stomach and esophagus to allow existing ulcers or inflammation to heal.
Veterinarians commonly prescribe omeprazole dosage for dogs in a safe range in order to treat a number of gastrointestinal problems including:
Is Omeprazole Safe for Dogs?
Yes, Omeprazole is generally thought to be safe for canines when administered under veterinary supervision and at the appropriate dose. It is readily tolerated by most animals. However, medicine safety is totally contingent upon proper dosing and knowledge of your dog's unique health profile.
Use with extra caution if your dog has:
Do not use omeprazole in dogs known to be allergic to it or to related PPI drugs.
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How Much Omeprazole Can You Give a Dog?
The veterinarian recommended Omeprazole dosage for treating acid reflux, gastritis, or a stomach ulcer in dogs is 0.5 to 1 mg/kg (0.25 to 0.5 mg/lb) of body weight. In some cases, a loading dose of 1 mg/kg IV followed by 8 mg/kg/d as a constant-rate infusion (CRI) may be prescribed by your veterinarian.
Remember, every health issue may require a different dose of medication, depending on factors such as your pet’s current health condition, medications already prescribed, and how they respond to the medicine. Your vet can ideally decide what omeprazole dosage will work best for your dog, keeping all these factors in mind.
Omeprazole for Dogs Dosage Chart by Weight
The most common question that we hear is, "How much omeprazole dosage can I give my dog?" The answer lies by using a simple calculation based on weight. To make this easier we have developed the below Omeprazole for dogs' dosage chart by weight.
| Dog’s Weight | Weight (kg) | Low Dose (0.5 mg/kg) | High Dose (1 mg/kg) |
|---|---|---|---|
| 5 lb | 2.27 kg | 1.14 mg | 2.27 mg |
| 10 lb | 4.54 kg | 2.27 mg | 4.54 mg |
| 15 lb | 6.80 kg | 3.40 mg | 6.80 mg |
| 20 lb | 9.07 kg | 4.54 mg | 9.07 mg |
| 25 lb | 11.34 kg | 5.67 mg | 11.34 mg |
| 30 lb | 13.61 kg | 6.80 mg | 13.61 mg |
| 40 lb | 18.14 kg | 9.07 mg | 18.14 mg |
| 50 lb | 22.68 kg | 11.34 mg | 22.68 mg |
| 60 lb | 27.22 kg | 13.61 mg | 27.22 mg |
| 70 lb | 31.75 kg | 15.88 mg | 31.75 mg |
| 80 lb | 36.29 kg | 18.14 mg | 36.29 mg |
| 90 lb | 40.82 kg | 20.41 mg | 40.82 mg |
| 100 lb | 45.36 kg | 22.68 mg | 45.36 mg |
Prilosec (Omeprazole) 20mg Dosage Chart for Dogs
| Dog Weight | Weight (kg) | Approx. Target Range | 20 mg Prilosec Tablet Dosage |
|---|---|---|---|
| 15 lb | 6.8 kg | 3.4–6.8 mg | ¼ tablet |
| 20 lb | 9.1 kg | 4.5–9.1 mg | ¼ tablet |
| 25 lb | 11.3 kg | 5.7–11.3 mg | ⅓ tablet |
| 30 lb | 13.6 kg | 6.8–13.6 mg | ⅓ tablet |
| 40 lb | 18.1 kg | 9.1–18.1 mg | ½ tablet |
| 50 lb | 22.7 kg | 11.3–22.7 mg | ½ tablet |
| 60 lb | 27.2 kg | 13.6–27.2 mg | ¾ tablet |
| 70 lb | 31.8 kg | 15.9–31.8 mg | ¾ tablet |
| 80 lb | 36.3 kg | 18.1–36.3 mg | 1 tablet |
| 90 lb | 40.8 kg | 20.4–40.8 mg | 1- ½ tablets |
| 100 lb | 45.4 kg | 22.7–45.4 mg | 2 tablets |
| 120 lb | 54.4 kg | 27.2–54.4 mg | 2 tablets |
Omeprazole 1 mg/mL or 2 mg/mL Oral Suspension Dosage Chart
Veterinarians usually recommend liquid omeprazole suspension for small puppies and dogs that have difficulty swallowing tablets. However, remember that some liquid oral suspensions may contain xylitol or other additives that can be toxic to dogs. Always check the ingredients before giving the medicine to your puppy and choose a dog-safe formulation recommended by your veterinarian.
| Dog Weight | Weight (kg) | Dose Range (0.5–1 mg/kg) | 1 mg/mL Suspension | 2 mg/mL Suspension |
|---|---|---|---|---|
| 5 lb | 2.3 kg | 1.15–2.3 mg | 1.15–2.3 mL | 0.58–1.15 mL |
| 10 lb | 4.5 kg | 2.25–4.5 mg | 2.25–4.5 mL | 1.13–2.25 mL |
| 15 lb | 6.8 kg | 3.4–6.8 mg | 3.4–6.8 mL | 1.7–3.4 mL |
| 20 lb | 9.1 kg | 4.55–9.1 mg | 4.55–9.1 mL | 2.28–4.55 mL |
| 30 lb | 13.6 kg | 6.8–13.6 mg | 6.8–13.6 mL | 3.4–6.8 mL |
| 40 lb | 18.1 kg | 9.05–18.1 mg | 9.05–18.1 mL | 4.53–9.05 mL |
| 50 lb | 22.7 kg | 11.35–22.7 mg | 11.35–22.7 mL | 5.68–11.35 mL |
| 70 lb | 31.8 kg | 15.9–31.8 mg | 15.9–31.8 mL | 7.95–15.9 mL |
How to Calculate Omeprazole Dosage for Your Dog
If you prefer calculating it by yourself, we provide you with the easy recipe to establish the dosage of omeprazole for dogs dosage by weight:
Step 1: Use kilograms for pounds conversion.
You should divide the weight of your dog (in pounds) by 2.2.
(Example: A 50 lb dog / 2.2 = 22.7 kg)
Step 2 Multiply by a range of dosages
For the low end of the dose multiply the weight in kg by 0.5 mg and for the high end of the dose multiply by 1.0 mg.
(Example: 22.7 kg x 0.5 mg = 11.35 mg 22.7 kg x 1.0 mg = 22.7 mg)
Result: A 50 lb dog should be administered from about 11 mg to 23 mg of omeprazole once daily.
Omeprazole vs. Esomeprazole for Dogs
Esomeprazole (brand name Nexium) is the S-isomer of omeprazole and works through the same proton-pump-inhibiting mechanism. However, veterinary dosing research for esomeprazole in dogs is far more limited than for omeprazole, and the two drugs are not automatically interchangeable at the same dose.
If your vet has specifically prescribed esomeprazole rather than omeprazole, follow their exact instructions rather than applying the omeprazole chart above the pharmacokinetics differ enough that a vet-confirmed dose matters even more here.
How Do I Get Omeprazole Dosage for My Dog?
This is a very common point of confusion with pet owners. Omeprazole Dosage is available over the counter for humans, however there is no FDA-approved formulation for dogs to be given.
This means that your vet will probably recommend you to buy the human version, but only when they have determined the correct dosage.
There are three basic ways that you can access omeprazole for your dog:
How to Give Omeprazole to Canines
Getting the dose right is now only half the battle. How you administer the medication is also of key importance.
Following these guidelines will insure the medication will do its job.
How Long Does It Take to Work, and How Long Is It Prescribed For?
Most dogs show symptom improvement within 1 to 5 days, with full acid suppression typically reached by day 3–4. Omeprazole is most often prescribed short-term 2 to 8 weeks for acute issues. For chronic conditions requiring longer use, your vet will monitor your dog periodically, since research has raised questions about the risks of extended PPI therapy.
Stopping long-term use: if your dog has taken omeprazole for more than 2–3 weeks, don't stop abruptly. Sudden discontinuation can trigger a rebound surge in stomach acid. Your vet will typically recommend a gradual taper.
Does Omeprazole Interact with Other Medications?
Because omeprazole changes stomach acidity and affects liver enzyme activity, it can alter how other drugs are absorbed and metabolized. Always tell your vet about every medication and supplement your dog takes.
| Medication | Effect When Combined With Omeprazole |
|---|---|
| Doxycycline | Absorption of this common antibiotic may be reduced if your dog is also prescribed doxycycline, ask your vet about spacing the two medications |
| Levothyroxine | Reduced absorption; hypothyroid dogs may need dose adjustment |
| Benzodiazepines (e.g., alprazolam, diazepam) | Increased blood concentration, raising side-effect risk |
| Digoxin | Increased bioavailability; requires monitoring |
| Ketoconazole / Itraconazole | Reduced absorption — these antifungals need stomach acid; space doses at least 2 hours apart |
| Warfarin | May increase bleeding risk |
| Clopidogrel | May decrease activation of this anti-clotting drug |
| Furosemide and other diuretics | Monitor for altered drug levels when combined |
| Phenobarbital | Potential altered metabolism; monitor seizure control |
Omeprazole is also frequently paired intentionally with other GI medications as part of a treatment plan. For example, vets sometimes combine it with the standard sucralfate to coat and protect actively healing ulcers, and Helicobacter-positive dogs are often placed on triple therapy that includes the appropriate metronidazole.
Dogs with steroid- or NSAID-related GI risk may also be started on a preventive omeprazole course alongside the prednisone to protect the stomach lining.
If nausea or vomiting accompanies the underlying GI issue, your vet may add the maropitant (Cerenia) to the plan.
None of these combinations should be started without direct veterinary guidance.
Potential Side Effects
Most dogs tolerate omeprazole well, but side effects are possible. They are usually mild and are gastrointestinal in nature.
Common side effects include:
- Vomiting or nausea.
- Diarrhea or constipation.
- Decreased appetite.
- Flatulence (passing gas).
Long Term Use Considerations:
Veterinarians are more concerned about long term use of PPIs. Recent studies have shown that prolonged use can cause an increase in the levels of the hormone gastrin (hypergastrinemia).
This is a physiological response to low acid but one that needs to be watched. There is also theoretical risk of affecting the absorption of nutrients (e.g. vitamin B12 (cobalamin), magnesium) over very long periods .
If your dog has prolonged or serious side effects, or if you notice symptom of an allergic reaction (such as facial swelling or hives) then stop the medication and contact your veterinarian immediately.
What to Do If Your Dog Eats a Human Omeprazole Pill
If your dog accidentally swallows a human-dosed omeprazole tablet including a strength or quantity beyond what your vet prescribed don't panic, but don't ignore it either.
Note how many milligrams and how many tablets were consumed, then call your veterinarian or an animal poison control center for guidance, especially for small dogs or higher total doses.
Omeprazole overdoses in dogs are uncommon and rarely serious, but professional confirmation is always the safer path.
FAQs
Can I use human omeprazole (Prilosec) on my dog?
Yes, the Omeprazole used in human products is the same type of drug used in the Veterinary Medicine. However, the dosage for a dog is different from a human. You will need a weight-specific dose from your veterinarian in order to be safe.
How much Omeprazole For Dogs Dosage can I give my 50lbs dog? (opeprazole).
Based on the standard dosage of 0.25 to 0.5 mg per pound, a 50lb dog would be given from 12.5 mg to 25mg once daily.
Can I give Omeprazole For Dogs Dosage to my dog twice daily?
The standard recommendation is once a day. However, for certain diseases such as severe esophagitis, a vet may use a higher total daily dose divided into two administrations (i.e. 1 mg/kg twice a day). And always stick to a particular frequency that your vet has prescribed for you.
What is the difference between Omeprazole and Famotidine (Pepcid for Dogs)?
Yes, they are both acid reducers, but they work differently. Omeprazole For Dogs Dosage is a proton pump inhibitor PPI, which blocks acid production at the source, and is generally regarded as more effective and longer lasting, particularly when on a long-term basis. Famotidine is an H2 Blocker drug that acts on the histamine receptors in the stomach. Vets will use one or the other depending on the severity of the condition and the needs of the dog.
My dog has eaten an Omeprazole pill accidentally. What should I do?
If your dog aeroogel human a dosage or lacks and accidentally ingests a human tonsillitis dose cuddled a human the it probably is unreasonable, especially from a medium or large breed, cause individual that with a human lot!
However, you should evaluate the amount which was consumed and call your veterinarian or a pet poison center for consultation especially if a higher dosage was given or if your dog is very small .
Final Thoughts
Getting the omeprazole dosage for your dog right by weight, in mg/kg, and with the correct timing gives an irritated stomach or esophagus the best chance to heal.
Use the chart and calculator above as a starting reference, but treat your veterinarian's specific prescription as the final word, especially if your dog has liver or kidney disease, is on other medications, or needs longer-term therapy.
