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You are here : 3-RX.com > Drugs & Medications > Quick Drug Information (DrugNotes) > Omeprazole (Oral)

Omeprazole (By Mouth)

Omeprazole (oh-ME-pray-zol)

Decreases stomach acid. Treats stomach ulcers and heartburn caused by acid from the stomach moving backwards into the esophagus.

Brand Name(s):

There may be other brand names for this medicine.

When This Medicine Should Not Be Used:

You should not use this medicine if you have ever had an allergic reaction to omeprazole.

How to Use This Medicine:

Delayed Release Capsule

  • Your doctor will tell you how much medicine to take and how often.
  • Omeprazole should be taken just before eating.
  • Swallow the capsule whole; do not open, chew or crush the capsule.
  • Do not stop taking this medicine until your doctor tells you to, even if you feel better.

If a dose is missed:

  • Take your medicine as soon as you remember that you missed your dose.
  • If it is nearly time for your next dose, wait until then to take the medicine and skip the missed dose.
  • You should not use two doses at one time.
How to Store and Dispose of This Medicine:

  • Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
  • Keep all medicine out of the reach of children.
Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Make sure your doctor knows if you are taking diazepam (Valium®), phenytoin (Dilantin®), blood thinners (Coumadin®), iron, ampicillin, or ketoconazole.
  • Avoid drinking alcohol or smoking tobacco because these things can increase your stomach acid.
Warnings While Using This Medicine:

  • If you are pregnant or breastfeeding, talk to your doctor before taking this medicine.
  • Let your doctor know if you have a current or past history of liver disease or if you have any blood disorders.
Possible Side Effects While Using This Medicine:

Call your doctor right away if you notice any of these side effects:

  • Unusual bleeding or bruising
  • Yellow skin and eyes
  • Sores in mouth
  • Extreme weakness

If you notice these less serious side effects, talk with your doctor:

  • Stomach pain
  • Constipation or diarrhea
  • Upset stomach or vomiting
  • Dizziness
  • Headache
If you notice other side effects that you think are caused by this medicine, tell your doctor.

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