Ranitidine 150 mg is a widely used medication belonging to the class of histamine-2 (H2) receptor antagonists. Known by its brand name Zantac, ranitidine is commonly prescribed to manage various gastrointestinal conditions. 

Mechanism of Action:

Ranitidine acts by selectively blocking histamine receptors in the stomach, specifically the H2 receptors located on the parietal cells. By inhibiting the action of histamine, ranitidine reduces the secretion of gastric acid, thereby alleviating symptoms associated with excess stomach acid production.

Indications for Use:

  1. Gastroesophageal Reflux Disease (GERD): Ranitidine 150 mg is commonly prescribed for the treatment of GERD, a chronic condition characterized by the reflux of stomach acid into the esophagus, leading to symptoms such as heartburn, regurgitation, and chest pain. By reducing gastric acid secretion, ranitidine helps alleviate symptoms and promote healing of esophageal mucosa.

  2. Peptic Ulcer Disease: Ranitidine is effective in the management of peptic ulcer disease, including gastric ulcers and duodenal ulcers. It helps promote ulcer healing and prevent ulcer recurrence by reducing acid production and creating a favorable environment for mucosal repair.

  3. Dyspepsia: Ranitidine 150 mg is also used to relieve symptoms of dyspepsia, including upper abdominal discomfort, bloating, and nausea. By decreasing gastric acid secretion, ranitidine helps improve symptoms and enhance overall gastrointestinal comfort.

  4. Zollinger-Ellison Syndrome: In rare cases, ranitidine may be prescribed for the management of Zollinger-Ellison syndrome, a rare disorder characterized by excessive gastric acid secretion due to gastrin-producing tumors in the pancreas or duodenum. Ranitidine helps control acid hypersecretion and alleviate associated symptoms in patients with this condition.

Dosage and Administration:

Ranitidine 150 mg is typically taken orally, either with or without food, as directed by a healthcare provider. The dosage may vary depending on the specific condition being treated and the individual patient’s response. It is usually taken once or twice daily, with the maximum recommended daily dose not exceeding 300 mg.

Safety and Side Effects:

Ranitidine is generally well-tolerated, with few adverse effects reported. Common side effects may include headache, dizziness, constipation, diarrhea, and fatigue. In rare cases, more serious adverse effects such as allergic reactions, liver dysfunction, or blood disorders may occur. Patients should seek medical attention if they experience any concerning symptoms while taking ranitidine.


Ranitidine 150 mg is a widely used medication with proven efficacy in the management of various gastrointestinal conditions, including GERD, peptic ulcer disease, dyspepsia, and Zollinger-Ellison syndrome. By inhibiting gastric acid secretion, ranitidine provides symptomatic relief and promotes mucosal healing, improving overall gastrointestinal health and quality of life for patients. However, it is essential to use ranitidine as directed by a healthcare provider and to be aware of potential side effects or interactions with other medications. With proper management, ranitidine remains an invaluable tool in the treatment of gastrointestinal disorders worldwide.