Prescription or OTCLower-cost generic availableClass: Gastrointestinal



Prescription or OTCLower-cost generic availableClass: Gastrointestinal
Back to: Full Site NavigationSkip to: side effects sectionSkip to: What to expect sectionSkip to: Risks and warnings sectionSkip to: Common concerns from users and pharmacists

Treats heartburn and stomach ulcers.

Skip Upsides & Downsides section. Skip to side effects section.

Our bottom line

Prevacid (lansoprazole) is an effective and inexpensive acid reducer commonly used to provide heartburn relief and help heal ulcers.


  • Most people can take Prevacid (lansoprazole) without any noticeable day-to-day side effects.
  • Comes in a dissolving tablet to be placed on the tongue if you cannot or do not like to swallow pills.
  • Prevacid (lansoprazole) lasts longer than other types of antacids (like Zantac, Pepcid, or Tums), and you only need to take it once a day.
  • You can take it in combination with a quick-acting antacid (like Maalox or Tums) if you need relief right away.
  • Prevacid (lansoprazole) is available over-the-counter and as inexpensive, generic options.
People say this drug is:
21 reviews


  • Doesn't start working right away like some other acid reducers (Tums, Rolaids, or Maalox).
  • May not be the best choice for patients 65 years of age and older due to risk of bone fractures and C. diff infection (bacterial).
  • Is used if you have frequent heartburns that occur more than 2 days per week. Speak to your doctor or pharmacist if you only have occasional heartburn.
How it works

Prevacid (lansoprazole) is a proton pump inhibitor (PPI). It lowers the amount of acid in your stomach by blocking the final step of stomach acid production.

People say this drug is:
21 reviews
Prevacid (lansoprazole) reviews
Used for
Dosage forms
  • Extended release
  • Dissolving tablet extended release
  • Liquid

What to expect when you take Prevacid (lansoprazole) for Reducing acid production

Skip what to expect section. Skip to Risks & Warnings section.
Skip side effects section. Skip to What to Expect and Pharmacists Tips section.

Side effect rates for Prevacid (lansoprazole)

3791 From clinical trials of Prevacid / All
  • Diarrhea
  • Abdominal pain

Risks and Warnings for Prevacid (lansoprazole)

Skip risks section. Skip to common concerns section.
  • Heartburn and feelings of upset stomach can be warning signs of a more serious stomach problem or cancer. If your symptoms do not go away or worsens after two weeks, or symptoms return after completing a course of treatment with Prevacid (lansoprazole), speak to your doctor as this may indicate a more serious problem.

Common concerns from people taking Prevacid (lansoprazole)

Final section. Do you want to return to drug navigation?
  • Prevacid (lansoprazole) is available over-the-counter and as inexpensive, generic options.
  • Some prescription drugs can interact with Prevacid (lansoprazole), so talk to your doctor or pharmacist about the medicines you are taking.
Kidneys and liver
  • Prevacid (lansoprazole) can cause acute kidney damage that can occur at any time during treatment. Stop taking Prevacid (lansoprazole) and speak to your doctor immediately if you notice blood in the urine, changes in urine output, swelling of the body, weight gain, fever, or confusion.
  • It made me have terrible abdominal pain along with constipation and pains in my upper esophageal area.