The active ingredient in Lansoprazole Delayed-Release Capsules, Lansoprazole for Delayed-Release Oral Suspension and Lansoprazole SoluTab Delayed- Release Orally Disintegrating Tablets is lansoprazole, a substituted benzimidazole, 2-[[[3-methyl-4-(2,2,2-trifluoroethoxy)-2-pyridyl] methyl] sulfinyl] benzimidazole, a compound that inhibits gastric acid secretion. Its empirical.