Active Ingredient: Active ingredient is lansoprazole 15 mg, an acid reducer; compare to the active ingredient of Prevacid 24 HR Heartburn Treatment: Delayed-release 24-hour heartburn medicine in a capsule; clinically proven to treat frequent heartburn (occurs 2 or more times a week) Acid Reducer: Reduces digestive discomfort of heartburn by deactivating acid-producing pumps in the stomach lining, inhibiting acid production at the source Frequent Heartburn Relief: Some people get complete relief within 24 hours; may take 1 to 4 days for full effect; take every day for 14 days to treat frequent heartburn (2 or more days a week); for ages 18 years and over Proton Pump Inhibitor: PPIs are the number one recommended type of over-the-counter acid reducer (of U.S. physicians surveyed by an independent market research firm)