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Prevacid Oral Precautions and Side Effects


IMPORTANT NOTE: The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate or effective for you. Consult your healthcare professional before using this drug.

Table of Contents

Generic Name: LANSOPRAZOLE DELAYED-RELEASE SUSPENSION - ORAL
Pronounced: (lan-SO-pruh-zole)

Prevacid Oral Side Effects

Constipation, diarrhea, or headache may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if this unlikely but serious side effect occurs:

  • stomach pain


Tell your doctor immediately if any of these highly unlikely but very serious side effects occur:

  • signs of vitamin B-12 deficiency with long-term (over 3 years) treatment (e.g., unusual weakness, sore tongue, numbness or tingling of the hands/feet)


A serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction include:

  • rash
  • itching/swelling (especially of the face/tongue/throat)
  • dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Prevacid Oral Precautions

Before taking lansoprazole, tell your doctor or pharmacist if you are allergic to it; or to similar drugs (e.g., omeprazole, pantoprazole); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of:

  • liver disease
  • other stomach problems (e.g., tumors)


Some symptoms may actually be signs of a more serious condition. Tell your doctor immediately if you have:

  • heartburn combined with lightheadedness/sweating/dizziness
  • chest pain or shoulder/jaw pain (especially with trouble breathing)
  • pain spreading to arms/neck/shoulders
  • unexplained weight loss


Proton pump inhibitors (such as lansoprazole) may increase your risk for bone fractures, especially with longer use, higher doses, and in older adults. Talk with your doctor or pharmacist about ways to prevent bone loss/fracture, such as by taking calcium (such as calcium citrate) and vitamin D supplements.

This medication should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor.

It is unknown if this drug passes into breast milk, but it may have undesirable effects on a nursing infant. Consult your doctor before breast-feeding.


CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.
Copyright 2007 First DataBank, Inc.

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