A c14 breath test (+) suggests infection with H. pylori, a causative agent of gastritis, ulcers and gastric cancer, so a positive H. pylori requires medication, commonly used as proton pump inhibitors, and other antibiotics. Generally, they include omeprazole enteric capsules, clarithromycin and methotrexate penicillin capsules. Clarithromycin is 0.5 grams each time, 2 times daily by mouth, omeprazole enteric capsules are two capsules each time, 2 times daily by mouth, and aminobenzyl penicillin capsules are 0.5 grams each time, 2 times daily by mouth, about the course of treatment is 7-14 days, and then recheck the urea nitrogen breath test to see if it is positive.