Lansoprazole is classified as a proton pump inhibitor, according to MedlinePlus. This type of medication treats ulcers caused by gastroesophageal reflux disease, or GERD, and other conditions where the stomach produces too much acid.
Lansoprazole is the generic name for the branded medication Prevacid. Other medications in the proton pump inhibitor classification include omeprazole (Prilosec), esomeprazole (Nexium), rabeprazole (AcipHex), pantoprazole (Protonix), and dexlansoprazole (Kapidex). While trials show that each of these drugs demonstrate similar efficacy, side effects may vary between drugs in the class, explains MedlinePlus. Although many of these medications are available over the counter, it is best to work with a doctor to manage any symptoms.