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      Ranitidine

      Generic Name: Ranitidine
      Common Brand Names: Zantac

      Introduction

      Ranitidine is an H2 receptor antagonist that reduces the production of stomach acid. It was commonly used for the treatment of acid-related gastrointestinal disorders, such as gastroesophageal reflux disease (GERD) and peptic ulcers. However, it has been withdrawn in many markets due to safety concerns related to potential carcinogenic impurities.

      Conditions of Use (Indications)

      1. Gastroesophageal Reflux Disease (GERD): To reduce acid reflux and heal esophageal damage.
      2. Peptic Ulcers: For the treatment and prevention of duodenal and gastric ulcers.
      3. Zollinger-Ellison Syndrome: In patients with excess stomach acid production due to neuroendocrine tumors.
      4. Heartburn Relief: Over-the-counter use for occasional heartburn.

      Mechanism of Action

      Ranitidine works by selectively blocking H2 receptors on the parietal cells of the stomach lining, which are responsible for producing gastric acid. By inhibiting these receptors, ranitidine reduces stomach acid production, providing relief from acid-related disorders and promoting the healing of ulcers.

      Side Effects

      1. Common:

      • Headache, dizziness, and fatigue.
      • Gastrointestinal disturbances such as nausea or constipation.

      2. Serious:

      • Hepatitis, jaundice, and other liver dysfunction symptoms.
      • Rare cases of blood dyscrasias, including thrombocytopenia and leukopenia.

      Harmful Interactions

      1. Warfarin: Ranitidine can increase the effects of warfarin, leading to an increased risk of bleeding.
      2. Ketoconazole: The absorption of ketoconazole may be reduced in the presence of H2 blockers like ranitidine, decreasing its efficacy.
      3. Theophylline: Ranitidine may increase the plasma levels of theophylline, raising the risk of toxicity.

      Contraindications

      1. Hypersensitivity to ranitidine or other H2 blockers.
      2. Severe liver dysfunction or cirrhosis (caution required in dosage adjustment).
      3. Concurrent use with certain drugs that depend on gastric pH for absorption, such as atazanavir.

      Latest References

      1. Wang, J., et al. (2023). “The Role of H2 Receptor Antagonists in Gastroesophageal Reflux Disease.” Journal of Gastroenterology, DOI: 10.1007/s00535-023-02023-0.
      2. FDA (2020). “Safety Concerns Regarding Ranitidine: Recall and Market Withdrawal.” FDA Updates.

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