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H2RA, or Histamine-2 Receptor Antagonist, represents a class of medications widely used in the treatment of gastrointestinal disorders such as gastroesophageal reflux disease (GERD), peptic ulcers, and gastritis. H2RAs work by blocking the action of histamine at the histamine-2 receptors in the stomach, thereby reducing the production of stomach acid and alleviating symptoms associated with excessive gastric acid secretion, such as heartburn, indigestion, and acid reflux. Commonly prescribed H2RAs include ranitidine (Zantac), famotidine (Pepcid), cimetidine (Tagamet), and nizatidine (Axid), which are available over-the-counter or by prescription in various formulations, including tablets, capsules, and oral suspensions. H2RAs are generally well-tolerated and have a favorable safety profile, making them a popular choice for the management of acid-related gastrointestinal conditions. However, long-term use of H2RAs may be associated with certain side effects, including headache, dizziness, diarrhea, and, in rare cases, more serious adverse reactions such as kidney problems or vitamin B12 deficiency. Despite their widespread use and effectiveness in symptom relief, H2RAs are sometimes supplemented or replaced by proton pump inhibitors (PPIs) in cases of severe or refractory acid-related disorders, as PPIs offer stronger and more sustained acid suppression. Nonetheless, H2RAs remain an important therapeutic option for millions of individuals worldwide seeking relief from acid-related gastrointestinal symptoms, providing a valuable adjunct to lifestyle modifications and other medical interventions aimed at optimizing digestive health and well-being.