LAN 15 Capsule contains Lansoprazole 15 mg, a proton pump inhibitor (PPI) used primarily to reduce gastric acid secretion. Lansoprazole acts by selectively inhibiting the H+/K+ ATPase enzyme system located on the gastric parietal cell surface, thereby suppressing the final step of acid production. This medication is indicated for the treatment of conditions such as gastroesophageal reflux disease (GERD), peptic ulcer disease, Zollinger-Ellison syndrome, and erosive esophagitis. It is also used in combination with antibiotics for the eradication of Helicobacter pylori infection to promote ulcer healing and prevent recurrence. LAN 15 Capsule is generally administered orally, with the dosage and duration tailored according to the specific condition and patient response. Common side effects may include headache, abdominal pain, nausea, diarrhea, and dizziness, though it is typically well tolerated. Caution is advised in patients with hepatic impairment, and long-term use should be monitored due to potential risks such as vitamin B12 deficiency, hypomagnesemia, and increased susceptibility to gastrointestinal infections. LAN 15 Capsule should be used under medical supervision, with attention to contraindications and potential drug interactions to ensure optimal therapeutic outcomes.