Leminoprazole Products | Cleanchem - Leminoprazole is a proton pump inhibitor similar to omeprazole, used to reduce gastric acid secretion. It is less commonly used but functions by irreversibly inhibiting the H+/K+ ATPase enzyme in parietal cells. Leminoprazole helps in treating peptic ulcers and acid reflux. It is typically well tolerated, with minor gastrointestinal discomfort as a side effect.