ACTIVE INGREDIENT: Amazon Basic Care Omeprazole Delayed Release Tablets 20 mg contain a Proton Pump Inhibitor (PPI), the top doctor recommended active ingredient for acid reduction (of U.S. physicians surveyed by an independent marketing firm), compare to Prilosec OTC TREATS FREQUENT HEARTBURN: Imagine life without heartburn; with just one pill every 24 hours, this acid reducer treats frequent heartburn that occurs 2 or more times a week ACID REDUCER: The active ingredient omeprazole 20 mg is a Proton Pump Inhibitor (PPI), which deactivates pumps in the stomach lining to reduce acid production at the source for 24 hours per single dose; heartburn relief around the clock NUMBER ONE: PPIs are the number one physician recommended type of OTC Acid Reducer (of U.S. physicians surveyed by an independent market research firm) 14-DAYS FOR HEARTBURN TREATMENT: One pill daily for relief that lasts 24 hours. Use as directed for 14 days; not intended for immediate relief of heartburn and may take 1 to 4 days for full effect