This page contains brief details about the drug , it's indication, dosage & administaration, mechanism of action, related brands with strength, warnings and common side effects.

Background and Date of Approval

The U.S. FDA approved Ranitidine for treating heartburn, indigestion, and acid indigestion on August 31, 2014. Ranitidine belongs to the family of medications known as the H2 receptor antagonist. It reduces stomach acid production by blocking the action of histamine. 

Mechanism of Action of undefined

Ranitidine reduces stomach acid production by blocking the action of histamine, a substance that triggers acid secretion in the stomach. This relieves symptoms caused by excess stomach acid, like heartburn and acid indigestion.

Uses of undefined

Ranitidine treats heartburn, indigestion, and acid indigestion and reduces the amount of acid the stomach produces. It is used for treating and preventing stomach ulcers. It also treats duodenal (small intestine) ulcers.

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Ranitidine Tablet

Take the Ranitidine as your physician advises. Do not crush, chew, or open the medicine. Your physician will decide the correct dosage and duration based on age, body weight, and disease condition. Only stop taking the tablet if your doctor advises you to stop. 


Ranitidine Injection

Ranitidine will be administered to you by a healthcare professional in a hospital setting. It is usually administered in a vein (intravenous). Your doctor will decide the dose, route of administration, and frequency based on your disease condition and other factors.


Warnings, Precautions and Side Effects of undefined


Do not consume Ranitidine if you are allergic to Ranitidine or its other ingredients. Notify your doctor if you have liver, lung, or kidney conditions. Before starting treatment with this medicine, notify your doctor if you have diabetes, immune system problems, acute porphyria, or a history of stomach ulcer or duodenal ulcer. 


Notify your doctor if you have lung, liver, or kidney problems. Your doctor may adjust your dose in such conditions. Inform your doctor if you are pregnant, planning to get pregnant, or think you may be pregnant or breastfeeding. Inform your doctor if you are more than 65 years of age. In case of impaired kidney function, a lower dose may be prescribed by your doctor.

Side Effects

The most common side effects of Ranitidine are constipation, stomach pain, sick feeling (nausea), and headache. Serious side effects while taking Ranitidine are allergic reactions (rash, itching, or hives on the skin, swelling on the lips, face, tongue, or other body parts, pain in the chest, shortness of breath, or wheezing), sudden fever, slow or irregular heartbeat, severe stomach pain (pancreatitis), kidney problem. 

Word Of Advice

Do not double-dose the medicine to make up for a forgotten dose. Notify your doctor if you experience any serious side effects. Liver and kidney patients should take Ranitidine cautiously and inform the doctor about all the underlying medical conditions and medications they consume.  

Do not stop the medicine until your doctor advises. Your medical professional will inform you if you need any dose adjustments. Contact your doctor for more information. Keep out of sight and reach of pets and children. Do not freeze the medicine. Do not store above 25°C. Always check the expiry date before consuming it.

Frequently Asked Question


  1. Noumed life science limited, Electronic Medicines Compendium (EMC), [Accessed on 7th June 2023],  pil.2497.pdf (
  2. GlaxoSmithKlin, US Food and Drug Administration; [Accessed on 7th June 2023],label (
  3. Alliance Pharmaceuticals Limited, Electronic Medicines Compendium (EMC), [Revised on May 2020]  [Accessed on 7th June 2023],  PATIENT INFORMATION LEAFLET (
  4. GlaxoSmithKlin, US Food and Drug Administration; [Accessed on 7th June 2023],label (
  5. Keith A. Sharkey and Wallace K. MacNaughton, Gastrointestinal Pharmacology, Pharmacotherapy for Gastric Acidity, Goodman & Gilman’s Pharmacological Basis of Therapeutics, 13th Edition, 2018, 909-913.


The drug information on this page is not a substitute for medical advice. It is meant for educational purposes only. For further details, consult your doctor about your medical condition to know if you are eligible to receive this treatment.