Phathom Pharmaceuticals Inc operates as a clinical-stage biopharmaceutical company. The firm is focused on developing and commercializing novel treatments for gastrointestinal, or GI, diseases. Its product comprises vonoprazan, an oral small-molecule potassium competitive acid blocker medicine that blocks acid secretion in the stomach. Vonoprazan shows rapid, potent, and durable anti-secretory effects and has demonstrated clinical benefits in the treatment of gastroesophageal reflux disease, and in combination with antibiotics for the treatment of Helicobacter pylori infection.