Generic name: Lansoprazole.

Prevacid is an acid pump inhibitor. It inhibits the production of gastric acid.

Quick Facts About Prevacid


Used to treat active duodenal ulcer on a short-term (up to 4 weeks) basis and erosive esophagitis for up to 8 weeks. Also used to treat certain pathological hypersecretory conditions such as Zoliinger-Ellison syndrome (too much stomach acid secretion), on a long-term basis.

Prevacid Dosage

Take before meals for best results. May take with an antacid. Swallow capsules whole; not to be crushed or chewed. If taking with sucralfate (Carafate), take at least 30 minutes prior to the Carafate. May take several days to see results; must adhere to schedule.

  • Usual adult dose: for short-term treatment of active duodenal ulcer — 15 milligrams once per day for up to 4 weeks. For severe erosive esophagitis — 30 milligrams once per day for up to 8 weeks; doctor may recommend a second 8-week treatment regimen. For pathological hypersecretory conditions — 60 milligrams once per day. Doctor may increase dosage depending on your response. If taking more than 120 milligrams per day, doctor will divide into smaller doses.
  • Usual child dose: Not generally prescribed for children.
  • Missed dose: take as soon as possible, unless almost time for next dose. In that case, do not take missed dose; go back to regular schedule. Do not double doses.

Prevacid Side Effects

Overdose symptoms:

none reported. However, if you suspect an overdose, immediately seek medical attention.

More common side effects:  diarrhea.

Less common Prevacid side effects: abdominal pain, nausea. Rare side effects: abnormal thinking, acne, aggravation of hostility, agitation, anemia, anxiety, apathy, arthritis, asthma, bad breath, belching, black or discolored stools, blood in urine, breast development in males, breast enlargement, breast tenderness, bronchitis, chest pain (including severe pain), colitis, confusion, constipation, cough, coughing up blood, deafness, decreased sex drive, depression, diabetes, difficult breathing, difficulty swallowing, dizziness, dry mouth, ear infection, eye pain, fainting, fever, fluid retention, flu-like symptoms, flushing, gallstones, gas, general feeling of illness, gout, hair loss, hallucinations, heart attack, hiccups, high blood pressure, high or low blood sugar, hives, impotence, increased appetite, increased salivation, indigestion, infection, inflammation of the esophagus or mouth, inflammation of the stomach lining, itching, kidney problems, kidney stones, loss of appetite, low blood pressure, memory loss, menstrual problems, muscle, bone, or joint pain, nervousness, nosebleeds, paralysis, “pins and needles,” pneumonia, rash, rectal hemorrhage, rectal and bladder spasms, ringing in ears, shock, sore throat stomac and intestinal hemorrhage, stroke, taste alteration, thirst throbbing heartbeat thyroid problems, visual disturbances, vomiting blood, weakness, weight gain or loss, wheezing, yeast infection.


Inform your doctor before combining Prevacid with:

ampicillin-containing medications such as Spectrobid, digoxin (Lanoxin); iron salts (Ferro-Sequels or Ferro-Sulfate); ketoconazole (Nizoral); sucralfate (Carafate); theophylline (Theo-Dur).

No known food/other substance interactions.

Special Cautions

If pregnant or planning to become pregnant inforrr your doctor immediately. Not known if Prevacid appears in breast milk; could affect a nursing infant

No special precautions apply to seniors.

Not prescribed for children.

  • Do not take Prevacid any longer than prescribed; not intended for long-term therapy of duodenal ulcer or erosive esophagitis.
  • If symptoms worsen or do not improve, contact your doctor. Do not discontinue use, even if symptoms have been relieved.
  • Inform your doctor before treatment if you have liver disease. Should be used with caution.
  • Prevacid has no effect on stomach cancer, even if it relieves symptoms.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Prevacid side effects, please contact your healthcare provider