Side Effects of Prilosec

Prilosec (omeprazole) belongs to a group of drugs called proton pump inhibitors. Omeprazole decreases the amount of acid produced in the stomach.

Prilosec is used to treat symptoms of gastroesophageal reflux disease (GERD) and other conditions caused by excess stomach acid. It is also used to promote healing of erosive esophagitis (damage to your esophagus caused by stomach acid).

Prilosec may also be given together with antibiotics to treat gastric ulcer caused by infection with helicobacter pylori (H. pylori).

Prilosec is not for immediate relief of heartburn symptoms.

Get emergency medical help if you have any of these signs of an allergic reaction to Prilosec: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these symptoms of low magnesium:

  • dizziness, confusion;
  • fast or uneven heart rate;
  • jerking muscle movements;
  • feeling jittery;
  • muscle cramps, muscle weakness or limp feeling;
  • cough or choking feeling; or
  • seizure (convulsions).

Less serious Prilosec side effects may include:

  • fever;
  • cold symptoms such as stuffy nose, sneezing, sore throat;
  • stomach pain, gas;
  • nausea, vomiting, diarrhea; or
  • headache.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

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