Prevacid Side Effects

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

Prevacid is used to treat and prevent stomach and intestinal ulcers, erosive esophagitis (damage to the esophagus from stomach acid), and other conditions involving excessive stomach acid such as Zollinger-Ellison syndrome.

Prevacid is not for immediate relief of heartburn symptoms.

Heartburn is often confused with the first symptoms of a heart attack. Seek emergency medical attention if you have chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, and a general ill feeling.

You should not use Prevacid if you are allergic to lansoprazole.

Ask a doctor or pharmacist if it is safe for you to take Prevacid if you have liver disease, or low levels of magnesium in your blood.

Do not use over-the-counter lansoprazole (Prevacid 24HR) without the advice of a doctor if you have:

  • trouble or pain with swallowing;
  • bloody or black stools;
  • vomit that looks like blood or coffee grounds;
  • heartburn that has lasted for over 3 months;
  • frequent chest pain;
  • heartburn with wheezing;
  • unexplained weight loss;
  • nausea or vomiting;
  • stomach pain; or
  • an electrolyte imbalance or metabolic disorder.

Some conditions are treated with a combination of Prevacid and antibiotics. Use all medications as directed by your doctor. Read the medication guide or patient instructions provided with each medication. Do not change your doses or medication schedule without your doctor’s advice.

Taking a proton pump inhibitor such as Prevacid may increase your risk of bone fracture in the hip, wrist, or spine. This effect has occurred mostly in people who have taken the medication long term or at high doses, and in those who are age 50 and older. It is not clear whether Prevacid is the actual cause of an increased risk of fracture. Before you take this medicine, tell your doctor if you have osteoporosis or osteopenia (low bone mineral density).

FDA pregnancy category B. Prevacid is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether lansoprazole passes into breast milk or if it could harm a nursing baby. Do not use Prevacid without telling your doctor if you are breast-feeding a baby.

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

Stop using Prevacid and call your doctor at once if you have symptoms of low magnesium:

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

Less serious Prevacid side effects may include:

  • headache;
  • nausea, stomach pain;
  • mild diarrhea; or
  • constipation.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

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