1) Acid 2) Lansoprazole 1) Lansoprazole 
A drug that reduces the amount of acid made in the stomach. It is used to treat stomach ulcers, gastroesophageal reflux disease (a condition in which acid from the stomach causes heartburn), and conditions in which the stomach makes too much acid. Prevacid is a type of proton pump inhibitor (PPI). Also called lansoprazole.