Prilosec OTC® Antacid

20.6 mg Omeprazole Magnesium per tablet Prilosec OTC works by directly blocking many of the active parietal cells in the gastric glands that produce acid before they start: Delayed-release formula helps it pass through tough stomach acids and can block the acid that causes frequent heartburn for 24 hours with 1 pill a day Treats frequent heartburn (frequent defined as occurring 2 or more days a week) Not intended for immediate relief of heartburn; this drug may take 1 to 4 days for full effect