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Zantac is an oral capsule consisting of an H2 blocker called ranitidine. We carry Zantac in both the brand choice and generic alternative in 150mg and 300mg. 

Zantac is commonly prescribed to treat heartburn caused by acid indigestion and sour stomach. Heartburn occurs during acid reflux, when a small portion of stomach contents are forced back up the esophagus, creating a burning pain in the lower chest. Additionally, this medication may also prevent heartburn associated with acid indigestion and sour stomach caused by eating certain foods or drinks, such as coffee, alcohol, and fatty or spicy foods. 

Zantac (ranitidine) is effective at treating heartburn because, as an H2 blocker, this medication is able to decrease the amount of acid created by the stomach. This not only help with heartburn, but will also relieve symptoms such as stomach pain, difficulty swallowing, and coughs that won’t go away.

Always follow directions given to you by your doctor. Most prescription labels have the directions written on them for your convenience.

For the treatment of symptoms; take 1 tablet, swallowed whole, with a glass of water.

For the prevention of symptoms; take 1 tablet, swallowed whole, with a glass of water 30 to 60 minutes before eating food or drinking beverages that cause heartburn.

Do not take more than 2 tablets in 24 hours (1 day).


You should not use this medication if you are allergic to ranitidine or other acid reducers if you have trouble or pain swallowing food if you have vomiting with blood, bloody or black stools, or kidney disease (unless otherwise directed by a doctor), or if you are using another acid reducer.

Dose adjustment or special precautions may be required.

To ensure this medication is safe for you, tell your doctor if you have had heartburn for longer than 3 months; heartburn with lightheadedness, sweating, or dizziness; chest or shoulder pain with shortness of breath, sweating, pain spreading to arms, neck or shoulders, or lightheadedness; frequent chest pain; frequent wheezing, particularly with heartburn; unexplained weight loss, nausea or vomiting; or stomach pain.


Zantac should only be used during pregnancy if the mother clearly needs it; discuss the risks and benefits with your doctor before using this medication if you are pregnant.

This drug passes into breast milk; speak with your doctor about the risks and benefits before using this medication if you are breastfeeding.

Tell your doctor about all medications, all medical conditions, and all drug allergies you may have before proceeding with treatment.

Side Effects

Common side effects of Zantac (ranitidine) may include:

Headache, constipation, or diarrhea.

The above side effects should not alarm you.

Serious side effects of Zantac (ranitidine) may include:

Blurred vision, mental/mood changes, easy bleeding/bruising, or severe tiredness.

If you have any of the above side effects, contact your doctor right away.

Please note this is not a complete list of side effects. Not everyone experiences side effects; they are not guaranteed. If you do have side effects and they become unmanageable, consult your doctor about alternate medications.

Contact your doctor if you notice signs of…

infection: sore throat that doesn't go away, fever, chills.


Can children use this medication?

Children who are at least 12 years old can use Zantac. Those under 12 should not use this medication, unless a doctor has specifically prescribed it.

How should I store this medication?

Store this medication at room temperature (20°-25°C (68°-77°F)) away from heat or moisture.

What are the signs of an allergic reaction?

Signs of an allergic reaction include sneezing and an itchy, runny or blocked nose (allergic rhinitis), itchy, red, or watering eyes (conjunctivitis), wheezing, chest tightness, shortness of breath, cough, a raised, itchy, red rash (hives) or swollen lips, tongue, eyes or face. Contact your doctor right away if you notice signs of an allergic reaction.

What drugs may interact with Zantac?

Some drugs that may interact with this medication include atazanavir, dasatinib, delavirdine, certain azole antifungals (such as itraconazole, ketoconazole), pazopanib, among others.

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