Laekit H-Pylori Kit contains Amoxicillin Clarithromycin and Lansoprazole. Amoxicillin is a penicillin antibiotic. Clarithromycin is a macrolide antibiotic. These antibiotics fight bacteria in the body. Lansoprazole decreases the amount of acid produced in the stomach. Amoxicillin clarithromycin and lansoprazole is a combination medicine used in people with Helicobacter pylori (H. pylori) infection and stomach ulcers. Helicobacter pylori (H. pylori) is a type of bacteria. These germs can enter your body and live in your digestive tract. After many years they can cause sores called ulcers in the lining of your stomach or the upper part of your small intestine. Infection with H. pylori is common.