Compare to the active ingredient of Prevacid 24 HR. Before taking your first bite of food for the day, take Equate Lansoprazole Delayed-Release Capsules 15 mg. Don't just relieve frequent heartburn, treat it with the clinically-proven active ingredient lansoprazole 15 mg, which works 24 hours to treat frequent heartburn, occurring 2 or more times a week. Not intended for immediate relief of heartburn, this heartburn medicine may take 1 to 4 days for full effect. For adults 18 years and older, take one capsule with water in the morning before eating. Reduces heartburn by decreasing the amount of acid produced by proton pumps in the stomach.