H2 antagonist

Patent Pending The H2 receptor antagonists (H2RA) are a class of drugs used to block the action of histamine on parietal cells (specifically the histamine H2 receptors) in the stomach, decreasing the production of acid by these cells. H2 antagonists are used in the treatment of dyspepsia, although they have been surpassed in popularity by the more effective[1] proton pump inhibitors.