Lan capsules, containing lansoprazole, are used for treating various acid-related conditions such as indigestion, heartburn, ulcers, and gastroesophageal reflux disease (GERD). Manufactured by Intas Pharmaceuticals, they come in 15 mg and 30 mg strengths and are effective in regimens for H. pylori eradication and long-term treatment of pathological hypersecretory conditions. Contraindications include hypersensitivity to lansoprazole and severe hepatic impairment, with known side effects such as diarrhea and abdominal pain.