What Is Sucralfate? Uses, Dosage, and What You Need to Know in 2026

Sucralfate is a prescription medication used to treat and prevent stomach and intestinal ulcers. Unlike most other GI drugs — which work by reducing acid production — sucralfate takes a completely different approach: it forms a physical protective barrier directly over ulcer sites, shielding damaged tissue from acid, digestive enzymes, and bile while healing occurs. This guide covers everything you need to know about sucralfate: what it treats, how it works, how to take it correctly, and what to expect.

What Is Sucralfate?

Sucralfate is the generic name for the drug sold under the brand name Carafate. It's classified as a GI protectant (also called an antiulcer agent or mucosal protectant). Chemically, sucralfate is an aluminum complex of sucrose octasulfate — essentially a sugar compound bonded with aluminum and sulfate groups that gives it its unique adhesive, protective properties.

The FDA first approved sucralfate in 1981. In 2023, it was the 240th most prescribed medication in the United States, with more than 1 million prescriptions. It is available as a generic, making it significantly more affordable than many newer GI medications.

What Conditions Does Sucralfate Treat?

Sucralfate has FDA-approved uses and several important off-label applications:

FDA-approved uses:

• Short-term treatment (up to 8 weeks) of active duodenal ulcers (ulcers in the first part of the small intestine)
• Maintenance therapy (up to 1 year) to prevent duodenal ulcer recurrence after healing

Common off-label uses:

• Gastric ulcers (stomach ulcers, not FDA-approved but widely used due to evidence of efficacy)
• GERD (gastroesophageal reflux disease)
• Stress ulcer prevention in critically ill (ICU) patients on ventilators
• Chemotherapy-induced mucositis (mouth sores during cancer treatment)
• Radiation proctitis (rectal inflammation from radiation therapy for cancer)
• Esophageal injury from button battery ingestion (recommended by the US Poison Control Center)
• Laryngopharyngeal reflux (throat reflux)

Available Forms and Dosage

Sucralfate comes in two formulations:

• Tablets: 1g (1000mg) oral tablets — the most common form, easy to store and take
• Oral suspension: 1g per 10mL liquid — preferred for patients with swallowing difficulties, esophageal indications, or those on tube feedings

Typical adult dosages:

• Active duodenal ulcer treatment: 1g (1 tablet or 10mL) four times daily for 4–8 weeks
• Maintenance therapy (preventing recurrence): 1g twice daily for up to 1 year

How to Take Sucralfate Correctly

Sucralfate must be taken correctly to work. The most important rules:

1. Take on an empty stomach. Take sucralfate 1 hour before each meal and at bedtime. Food in the stomach prevents the drug from binding properly to the ulcer site.
2. Separate from other medications. Take sucralfate at least 2 hours before or after other oral medications. Sucralfate binds to many drugs in the GI tract, reducing their absorption significantly.
3. Separate from antacids. Don't take antacids within 30 minutes before or after sucralfate — antacids can interfere with how sucralfate activates in the stomach.
4. Complete the full course. Treatment should continue for the full 4–8 weeks even if symptoms improve earlier. Stopping too soon may allow the ulcer to reopen.
5. Shake the suspension. If using the liquid form, shake well before measuring each dose. Use a proper measuring device, not a kitchen spoon.

How Long Until Sucralfate Works?

Unlike antacids that provide near-immediate acid neutralization, sucralfate works gradually as it forms a protective barrier over time. It may take 2–8 weeks before you experience the full benefit. Don't expect instant relief of symptoms — sucralfate is a healing agent, not a pain reliever. Your doctor may allow antacids for pain relief, taken at least 30 minutes away from sucralfate doses.

Where to Get Sucralfate

Sucralfate is prescription-only and requires a doctor's visit or telehealth consultation. Once you have a prescription, use medfinder to locate which pharmacies near you have it in stock. For more on what to expect while taking it, read our guide on sucralfate side effects.