Active Ingredient

Ranitidine

Ranitidine is a medication that helps reduce stomach acid production. It is commonly used to treat conditions related to excessive stomach acid.

By lowering acid levels, it can help alleviate symptoms and promote healing in the digestive tract.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Ranitidine Brands

Zantac

Strengths 150 mg, 300mg

Strengths 300mg

Ranitidine is typically used to manage and treat conditions associated with high stomach acid.

Ranitidine works by blocking H2 receptors in the stomach lining. These receptors are responsible for signaling the production of stomach acid.

By inhibiting these signals, ranitidine reduces the amount of acid produced, helping to relieve symptoms and allow healing of affected tissues.

Not everyone experiences side effects from ranitidine, and many of them are mild and temporary.

If you experience any persistent or severe symptoms, contact your doctor.

Monitor your symptoms and report any unusual changes to your healthcare provider.
Avoid consuming large amounts of alcohol while taking ranitidine.
Inform your doctor about any other medications you are taking to prevent interactions.
Do not use ranitidine if you experience difficulty swallowing or persistent stomach pain.
Seek medical advice if your symptoms do not improve or worsen.

Always consult your doctor for personalized medical advice.

How does ranitidine help with heartburn?

Ranitidine reduces stomach acid production, which can help alleviate heartburn symptoms.

How long does it take for ranitidine to work?

Ranitidine usually begins to work within a few hours, but it may take a few days to feel the full effect.

Can I take ranitidine with other medications?

It’s important to discuss all medications you’re taking with your doctor to avoid potential interactions.

Is ranitidine safe for long-term use?

Your doctor will determine the appropriate duration for using ranitidine based on your specific condition.

What should I do if I miss a dose of ranitidine?

If you miss a dose, take it as soon as you remember, but skip it if it’s almost time for your next dose.