OMASTIN 150mg Capsules (20) contain Omeprazole, a proton pump inhibitor (PPI) used to treat acid reflux, gastroesophageal reflux disease (GERD), stomach ulcers, and conditions that cause excessive stomach acid production. It works by reducing the amount of acid in the stomach, helping to prevent irritation and promote healing. Always follow your healthcare provider’s instructions for proper dosage and usage.