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What Is Ranitidine?

Ranitidine is a histamine-2 receptor antagonist that reduces stomach acid production. It is used to treat selected acid-related digestive conditions, including peptic ulcers, gastroesophageal reflux disease, and certain disorders involving excessive acid secretion. Ranitidine was formerly marketed under the Zantac brand name. In April 2020, the FDA requested withdrawal of ranitidine products because the NDMA impurity could increase during storage. On November 24, 2025, the FDA approved reformulated prescription ranitidine tablets following additional safety testing and manufacturing changes. The newly approved tablets are available in 150 mg and 300 mg strengths and have specific storage requirements.

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What Is Ranitidine?

Ranitidine is a histamine-2 receptor antagonist that reduces stomach acid production. It is used to treat selected acid-related digestive conditions, including peptic ulcers, gastroesophageal reflux disease, and certain disorders involving excessive acid secretion. Ranitidine was formerly marketed under the Zantac brand name. In April 2020, the FDA requested withdrawal of ranitidine products because the NDMA impurity could increase during storage. On November 24, 2025, the FDA approved reformulated prescription ranitidine tablets following additional safety testing and manufacturing changes. The newly approved tablets are available in 150 mg and 300 mg strengths and have specific storage requirements.

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How Does Ranitidine Work?

Ranitidine blocks histamine H2 receptors on acid-producing cells in the stomach. Histamine normally activates these receptors and stimulates gastric acid secretion. Blocking the receptors reduces both daytime and nighttime acid production, allowing ulcers and certain acid-related tissue injuries to heal. Ranitidine does not directly neutralize stomach acid already present, as antacids do. The reformulated tablets retain the drug's acid-reducing mechanism while incorporating manufacturing and storage controls intended to address previous NDMA impurity concerns. Ranitidine does not eliminate the underlying cause of every digestive disorder or replace appropriate evaluation for persistent symptoms.

What Conditions Does Ranitidine Treat?

Prescription ranitidine tablets are indicated for short-term treatment of active duodenal and benign gastric ulcers and maintenance therapy after healing of certain ulcers. They also treat gastroesophageal reflux disease, erosive esophagitis, and pathological acid hypersecretory conditions such as Zollinger-Ellison syndrome. Specific pediatric dosing information is included in the prescribing label. Treatment decisions depend on the condition, age, kidney function, and severity of symptoms. Ranitidine is not an antibiotic and does not eradicate Helicobacter pylori on its own. Gastrointestinal bleeding, difficulty swallowing, or unexplained weight loss requires medical evaluation even when acid-related symptoms improve.

How Should Ranitidine Be Taken?

Ranitidine is taken orally according to the prescribed indication and patient characteristics. A common adult regimen for active duodenal ulcers is 150 mg twice daily or 300 mg once daily after the evening meal or at bedtime. Symptomatic gastroesophageal reflux disease commonly uses 150 mg twice daily, while erosive esophagitis may require a different schedule. Patients with impaired kidney function may need less frequent dosing. Reformulated ranitidine tablets must remain in their original bottle, protected from moisture and light, with the cap tightly closed and the desiccant left inside. Once opened, unused tablets must be discarded after 90 days or by the printed expiration date, whichever occurs first.

What Are the Side Effects and Warnings of Ranitidine?

Possible adverse effects include headache, dizziness, constipation, diarrhea, nausea, and abdominal discomfort. Rare but serious reactions include hypersensitivity, blood cell abnormalities, liver injury, and changes in heart rhythm. Central nervous system effects, including confusion, have been reported, particularly in susceptible patients. Ranitidine is cleared primarily through the kidneys, making dosage adjustments important in kidney impairment. Older ranitidine formulations were withdrawn because of NDMA impurity formation during storage; newly approved reformulated tablets have stricter handling instructions. Patients should not use expired tablets or products stored contrary to the label. Severe allergic symptoms, unusual bleeding, or persistent digestive symptoms require medical assessment.

Common Questions About Ranitidine

Is ranitidine available again in the United States?

Yes. The FDA approved reformulated prescription ranitidine tablets in November 2025 after older products were withdrawn in 2020 over NDMA impurity concerns.

Is ranitidine the same as Zantac?

Original Zantac products contained ranitidine. The Zantac name has also been used for famotidine products, so patients should check the active ingredient rather than relying on the brand name alone.

Why was ranitidine removed from the market?

The FDA requested withdrawal in April 2020 after finding that NDMA impurity levels could increase over time and with higher storage temperatures. Reformulated tablets were subsequently approved.

How long can reformulated ranitidine tablets be kept after opening?

Unused tablets must be discarded 90 days after the bottle is first opened or by the labeled expiration date, whichever comes first. They should remain in their original tightly closed container.

References

DailyMed - RANITIDINE tablet. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=0fba6615-37c2-4ba6-b6e5-09599369a5bc. Date Accessed November 3, 2026.

FDA Approves Reformulated Ranitidine Following Comprehensive Safety Review. U.S. Food and Drug Administration. https://www.fda.gov/drugs/drug-safety-and-availability/fda-approves-reformulated-ranitidine-following-comprehensive-safety-review. Date Accessed November 3, 2026.

Questions and Answers: NDMA Impurities in Ranitidine (Commonly Known as Zantac). U.S. Food and Drug Administration. https://www.fda.gov/drugs/drug-safety-and-availability/questions-and-answers-ndma-impurities-ranitidine-commonly-known-zantac. Date Accessed November 3, 2026.

Ranitidine. MedlinePlus. https://medlineplus.gov/druginfo/meds/a601106.html. Date Accessed November 3, 2026.

Ranitidine. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Ranitidine. Date Accessed November 3, 2026.