Ranitidine 300 mg tablet uses?

Ranitidine (H₂‑receptor antagonist) – 300 mg tablet

| What it is | 300 mg ranitidine tablet (brand‑names: Zantac, Ranitidine, etc.) |
|------------|---------------------------------------------------------------|
| Main use | Reduction of stomach acid production by blocking histamine‑H₂ receptors on gastric parietal cells. |
| Common indications | • Gastro‑oesophageal reflux disease (GERD) – heartburn, acid regurgitation.
• Peptic ulcer disease (duodenal or gastric) – healing and symptom relief.
• Zollinger‑Ellison syndrome – excess gastrin‑producing tumours causing severe acid hypersecretion.
• Acid‑related gastritis – mild to moderate. |
| Typical dosing | • Adults: 150 mg once or twice daily for short‑term treatment (2–4 weeks).
• 300 mg once or twice daily for more severe conditions or maintenance therapy.
• For Zollinger‑Ellison: 300 mg every 6–8 hours or continuous infusion. |
| Why 300 mg? | Higher dose provides stronger acid suppression, useful for refractory GERD, ulcers that need aggressive control, or when a patient can’t tolerate more frequent dosing. |
| How it works | Ranitidine competitively blocks histamine‑H₂ receptors → ↓ cAMP → ↓ H⁺/K⁺‑ATPase activity → ↓ gastric acid secretion. |
| Key cautions | • NDMA contamination – many ranitidine products were recalled (2019‑2021) after NDMA (a potential carcinogen) was found in some formulations. Check local regulatory status.
• Renal impairment – dose adjustment may be required (often 150 mg q12h instead of 300 mg).
• Drug interactions – reduces absorption of drugs that need acidic pH (e.g., ketoconazole, atazanavir).
• Adverse effects – headache, dizziness, constipation/diarrhoea, rare allergic reactions. |
| Alternatives | Proton‑pump inhibitors (PPIs) like omeprazole, esomeprazole, pantoprazole offer deeper acid suppression; often preferred for chronic conditions. |
| Bottom line | A 300 mg ranitidine tablet is a potent acid‑suppressing medication used mainly for GERD, ulcers, and gastrin‑driven acid overproduction, but its use has declined in many regions due to safety concerns. Always consult a healthcare professional for proper dosing, monitoring, and to confirm that the product is still approved for use in your area.