How does sucralfate work to treat/prevent gastric ulcers?

Sucralfate works primarily by forming a paste-like barrier over the surface of gastric ulcers. It is a sucrose sulfate compound that, when in contact with gastric acid, undergoes a change to form a gel-like substance. This substance strongly adheres to ulcer sites, providing a protective layer that shields the ulcers from further damage caused by gastric acids and digestive enzymes. This barrier not only protects the ulcer but also creates an environment conducive to healing.

The other options involve mechanisms that do not accurately represent the action of sucralfate. Increasing gastric acid production would worsen ulcer symptoms and hinder healing. Reducing gastric motility is not a function of sucralfate; instead, it focuses on protection and healing. Neutralizing stomach acid is a function of antacids, not sucralfate, which does not alter acid levels but rather protects the existing tissue. Thus, the correct choice underscores the unique protective effect of sucralfate in the treatment and prevention of gastric ulcers.