Prevacid is a powerful medication available in 15 mg and 30 mg dosages, formulated with the active ingredient lansoprazole. It is highly effective in treating conditions related to excessive stomach acid, such as gastroesophageal reflux disease (GERD), stomach ulcers, and Zollinger-Ellison syndrome. Manufactured by reputable companies, Prevacid is also sold under various brand names, ensuring broad availability across different markets.