Lancid belongs to a class of antisecretory compounds, the substituted benzimidazoles, that do not exhibit anticholinergic or histamine H2-receptor antagonist properties.Lansoprazole is used short-term (4-8 weeks) to treat duodenal ulcer and erosive esophagitis. It may used long term to treat Zollinger-Ellison syndrome, a problem with too much acid being secreted. Lansoprazole capsules should be taken before eating.