O-Gas Capsule SR is a combination pharmaceutical formulation containing Domperidone 30 mg and Rabeprazole 20 mg, designed for the management of gastrointestinal disorders characterized by acid reflux, dyspepsia, and delayed gastric emptying. Domperidone, a peripheral dopamine D2 receptor antagonist, enhances gastrointestinal motility by increasing the tone of the lower esophageal sphincter and accelerating gastric emptying, thereby alleviating symptoms such as nausea, vomiting, and bloating. Rabeprazole, a proton pump inhibitor, suppresses gastric acid secretion by irreversibly inhibiting the H+/K+ ATPase enzyme system in the gastric parietal cells, providing effective relief from acid-related mucosal damage and promoting ulcer healing. The sustained-release formulation ensures a prolonged therapeutic effect, improving patient compliance by reducing dosing frequency. O-Gas Capsule SR is indicated for the treatment of gastroesophageal reflux disease (GERD), erosive esophagitis, and functional dyspepsia where acid suppression combined with prokinetic action is beneficial. It should be used under medical supervision, with caution in patients with known hypersensitivity to either component, and is contraindicated in individuals with gastrointestinal hemorrhage, obstruction, or perforation. Adverse effects may include headache, dry mouth, and abdominal cramps, and drug interactions should be carefully monitored.