Prevacid 24HR is the over-the-counter version of prescription Prevacid (
lansoprazole), though the two are not considered equivalent. It is a
proton pump inhibitor (
PPI) used to treat frequent
heartburn by reducing the acid in the stomach. Generic lansoprazole is also available over the counter. Get Lansoprazole 24hr for as low as $9.40, which is 79% off the average retail price of $45.76 for the most common version, by using a GoodRx coupon.