Active Ingredient

Lansoprazole

Lansoprazole is a medication used to reduce stomach acid production. It belongs to a class of drugs known as proton pump inhibitors.

It is commonly prescribed for conditions where reducing stomach acid is beneficial, such as acid reflux and ulcers.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Lansoprazole Brands

Prevacid

Strengths 15 mg, 30mg

Lansoprazole is used to treat various conditions related to excessive stomach acid production.

Gastroesophageal reflux disease (GERD)
Stomach and duodenal ulcers
Erosive esophagitis
Zollinger-Ellison syndrome
Prevention of stomach ulcers caused by nonsteroidal anti-inflammatory drugs (NSAIDs)

Lansoprazole works by blocking the proton pump in the stomach lining. This pump is responsible for secreting stomach acid.

By inhibiting this pump, Lansoprazole effectively reduces the overall production of stomach acid.

This helps in healing acid-related damage to the stomach and esophagus and provides relief from symptoms.

Not everyone experiences side effects with Lansoprazole, and many are mild and temporary.

If you experience serious or persistent symptoms, contact your healthcare provider.

Take Lansoprazole as directed by your healthcare provider.
Avoid heavy alcohol consumption while taking this medication.
Inform your doctor about any other medications or supplements you are taking to avoid interactions.
Do not use Lansoprazole if you experience difficulty swallowing, bloody stools, or persistent vomiting.
Monitor your symptoms and report any unusual changes to your doctor.

Always consult your healthcare provider for personalized medical advice.

How long does Lansoprazole take to work?

Lansoprazole may start to relieve symptoms within a few days, but it might take longer for full benefits. Consult your doctor if symptoms persist.

Can Lansoprazole be taken long-term?

Only take Lansoprazole long-term if advised by your healthcare provider, as prolonged use may have additional risks.

Is it safe to take Lansoprazole with other medications?

Lansoprazole can interact with certain medications. Always inform your doctor about all medicines you are taking.

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

If you miss a dose, take it as soon as you remember unless it’s almost time for your next dose. Do not double up doses.

Can Lansoprazole cause allergic reactions?

Though rare, some people may experience allergic reactions. Seek medical attention if you notice symptoms like rash, itching, or swelling.