What Is Sucralfate and What Does It Treat?
Sucralfate is a gastrointestinal protectant used in dogs to treat and prevent ulcers and erosions in the digestive tract. It is widely known by the brand name Carafate (and Antepsin in some countries). Unlike acid-reducing drugs, sucralfate does not lower stomach acid — instead, it acts like a bandage applied from the inside.
When sucralfate reaches the acidic environment of the stomach, it becomes sticky and binds preferentially to damaged, ulcerated tissue, forming a protective paste-like barrier over the sore area. This barrier shields the ulcer from stomach acid, pepsin and bile so the tissue underneath can heal. It also promotes local protective factors. Importantly, sucralfate stays in the gut and is barely absorbed into the bloodstream, which is a big part of why it is so safe.
Veterinarians prescribe sucralfate for dogs with:
- Gastric and duodenal (stomach and intestinal) ulcers
- Esophagitis — inflammation of the food pipe, including acid-reflux damage and oesophageal irritation
- Gastrointestinal bleeding or erosions, including ulcers linked to NSAID pain medication
- General GI protection in dogs at risk of ulceration
Sucralfate is almost always used alongside other treatment — acid reducers such as famotidine or omeprazole, anti-nausea medication, and management of the underlying cause. The calculator above estimates a size-based dose; for related medicines see PuppaDogs’ guides to sucralfate for dogs, Carafate for dogs and Pepcid (famotidine) for dogs.
How the Sucralfate Dosage Calculator Works
Sucralfate is dosed by body size rather than a precise milligram-per-kilogram formula. The calculator:
- Places your dog in a size band and shows the dose per administration in grams.
- Converts it into 1 g tablets or millilitres of oral suspension.
- Shows the frequency and estimated daily total.
- Highlights the all-important timing and drug-interaction rules.
Enter your dog’s weight, choose the dosing frequency and the form you have, tick any health considerations, then press Calculate Dose.
How Sucralfate Doses Are Calculated for Dogs
Size-Based Dosing
Sucralfate is typically dosed by the dog’s size:
- Small dogs (up to about 10 kg / 22 lb): roughly 0.25–0.5 g per dose
- Medium dogs (about 10–20 kg / 22–44 lb): about 0.5 g per dose
- Large dogs (over about 20 kg / 44 lb): about 1 g per dose
It is given every 6 to 12 hours. For an active ulcer, more frequent dosing — three or four times daily — generally works better than twice daily, because the protective coating needs regular renewal.
The Two Rules That Make Sucralfate Work
Sucralfate’s effectiveness depends almost entirely on how it is given:
- Give it on an empty stomach. Sucralfate needs stomach acid to activate and stick. Give it about 1 hour before or 2 hours after food.
- Separate it from other medications. Sucralfate binds other drugs in the gut and can significantly reduce their absorption. Every other oral medication should be given at least 2 hours apart from sucralfate.
Getting these two things right matters more than fine-tuning the milligram amount.
Sucralfate Dosage Chart for Dogs
This chart shows the typical dose per administration. It is a reference only — your veterinarian’s prescription takes priority.
| Dog weight | Dose per administration | Frequency |
|---|---|---|
| Under 22 lb (under ~10 kg) | 0.25–0.5 g | Every 6–12 hours |
| 22–44 lb (~10–20 kg) | 0.5 g | Every 6–12 hours |
| Over 44 lb (over ~20 kg) | 1 g | Every 6–12 hours |
Sucralfate Forms and Strengths
- Tablets: most commonly 1 g, and usually scored so they can be split.
- Oral suspension: a liquid, commonly 1 g per 10 mL, which many vets prefer because it spreads and coats the gut lining more evenly — especially useful for esophagitis.
- Compounded preparations: a pharmacy can prepare smaller or flavoured doses. A simple home option is to crush a tablet and mix it with a little water into a slurry, if your vet advises this.
How to Give Sucralfate to Your Dog
- Time it around meals: 1 hour before or 2 hours after food.
- Keep it away from other medicines by at least 2 hours, in both directions.
- A slurry can work well: crushing a tablet into a small amount of water can help it coat the oesophagus and stomach, particularly for reflux or esophagitis — ask your vet.
- Stay consistent with the schedule; for ulcers, regular dosing keeps the protective layer renewed.
- Complete the course. Ulcers can take a couple of weeks or more to heal even after symptoms improve.
Side Effects and Safety
Sucralfate is one of the safest medications used in dogs, precisely because it works locally and is barely absorbed. Side effects are uncommon.
- Constipation is the most frequently reported effect.
- Drug interactions are the main practical concern — sucralfate reduces the absorption of many other oral drugs (including some antibiotics, thyroid medication, certain heart drugs and other antacids) unless they are separated by at least 2 hours.
- Sucralfate contains aluminium. This is not a problem for healthy dogs, but in dogs with kidney disease aluminium can accumulate over time, so it should be used cautiously and under veterinary supervision in those patients.
Tell your veterinarian about every medication and supplement your dog receives, so the dosing schedule can be arranged to avoid interactions.
Treatment Duration and Monitoring
Sucralfate is usually given as a short-to-medium course — often 1–4 weeks — to allow ulcers or esophagitis to heal, with the length set by your veterinarian. Because sucralfate treats the *damage* rather than the *cause*, your vet will also work to identify and address why the ulcer developed — for example NSAID use, a foreign body, kidney or liver disease, or a clotting problem. Watch for and report vomiting (especially with blood or a coffee-ground appearance), black tarry stool, loss of appetite, abdominal pain or pale gums, which can indicate ongoing GI bleeding and need prompt veterinary attention.
Conclusion
Sucralfate (Carafate) is a remarkably safe, effective “internal bandage” for stomach and intestinal ulcers and esophagitis in dogs, dosed simply by size — roughly 0.25–0.5 g for small dogs and 1 g for large dogs, every 6–12 hours. The calculator above estimates the dose and converts it into tablets or liquid. The real key to success is not the exact milligram amount but the timing: give sucralfate on an empty stomach and keep it at least 2 hours away from every other medication. Use it under veterinary guidance, alongside treatment of the underlying cause, and complete the full course so the gut lining can fully heal.
Frequently Asked Questions
How much sucralfate can I give my dog?
Sucralfate is dosed by size rather than a strict milligram-per-kilogram formula. Typical doses are roughly 0.25-0.5 g per dose for small dogs (up to about 22 lb), about 0.5 g for medium dogs, and about 1 g for large dogs, given every 6 to 12 hours. Your veterinarian sets the exact dose, frequency and course length; use the calculator above for an estimate only.
Should sucralfate be given on an empty stomach?
Yes. Sucralfate needs stomach acid to activate and form its protective coating, so it should be given on an empty stomach – about 1 hour before or 2 hours after a meal. Giving it correctly relative to food is one of the most important factors in whether the medication works.
Can sucralfate be given with other medications?
Not at the same time. Sucralfate binds many other oral drugs in the gut and reduces their absorption, so every other oral medication should be given at least 2 hours apart from sucralfate. This includes many antibiotics, thyroid medication, certain heart drugs and antacids. Tell your vet everything your dog takes so the schedule can be arranged.
How long does sucralfate take to work in dogs?
Sucralfate begins coating and protecting damaged tissue soon after it is given, and many dogs show symptomatic improvement within a few days. However, ulcers and esophagitis themselves take longer to heal fully – often one to several weeks – so it is important to complete the entire course your veterinarian prescribes.
What are the side effects of sucralfate in dogs?
Sucralfate is one of the safest medications used in dogs because it works locally and is barely absorbed. The most common side effect is mild constipation. Its main practical drawback is reducing the absorption of other oral drugs unless they are separated by 2 hours. Because it contains aluminium, it should be used cautiously in dogs with kidney disease.
Is sucralfate the same as Carafate?
Yes. Carafate is a common brand name for the drug sucralfate (it is also sold as Antepsin in some countries). Whether labelled as Carafate, Antepsin or generic sucralfate, it is the same active medication and is used and dosed in the same way for dogs under veterinary guidance.
References & Further Reading
The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.
- Plumb DC. Plumb’s Veterinary Drug Handbook. 10th ed. Hoboken, NJ: Wiley-Blackwell, 2023 – sucralfate monograph.
- Merck Veterinary Manual. Gastrointestinal ulceration and erosion in small animals; gastroprotectant drugs. merckvetmanual.com.
- Marks SL, et al. ACVIM consensus statement: Rational administration of gastrointestinal protectants to dogs and cats. Journal of Veterinary Internal Medicine. 2018;32(6):1823-1840.
- Veterinary Partner (VIN). Sucralfate (Carafate) for dogs and cats. veterinarypartner.vin.com.
- PuppaDogs. Sucralfate for Dogs: Benefits, Dosage, Side Effects, and More. puppadogs.com.
