The document summarizes various drugs used to treat acid-related gastrointestinal disorders. It describes the mechanisms and effects of antacids, H2 blockers, proton pump inhibitors, sucralfate, and misoprostol. Antacids neutralize stomach acid but do not prevent its production, while H2 blockers and proton pump inhibitors suppress acid secretion through different mechanisms. Sucralfate forms a protective barrier over ulcers and erosions, and misoprostol protects the gastric mucosa.