Medically reviewed: January 22, 2018
What is Prevpac?
Lansoprazole decreases the amount of acid produced in the stomach.
Prevpac is a combination medicine used in people with Helicobacter pylori (H. pylori) infection and stomach ulcers. Treating H. pylori infection can help prevent future stomach ulcers.
Prevpac may also be used for purposes not listed in this medication guide.
You should not take this medicine if you have a history of long QT syndrome or certain heart rhythm disorders, or a history of liver problems caused by taking clarithromycin.
You also should not take this medicine if you have ever had a severe allergic reaction to certain antibiotics, including azithromycin (Zithromax, Z-Pak), erythromycin, telithromycin, amoxicillin or other penicillins (ampicillin, Amoxil, Augmentin, Trimox, and others), or cephalosporins (Duricef, Keflex, Spectracef, and others).
Serious drug interactions can occur when certain medicines are used together. Tell each of your healthcare providers about all medicines you use now, and any medicine you start or stop using.
Before taking this medicine
you have a history of long QT syndrome or certain heart rhythm disorders;
you have ever had liver problems or jaundice caused by taking clarithromycin;
Some medicines can cause unwanted or dangerous effects when used with Prevpac. Your doctor may need to change your treatment plan if you use any of the following drugs:
colchicine (if you also have liver or kidney disease);
To make sure Prevpac is safe for you, tell your doctor if you have:
an electrolyte imbalance or metabolic disorder.
Taking a proton pump inhibitor such as lansoprazole 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 lansoprazole is the actual cause of an increased risk of fracture.
It is not known whether this medicine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.
Amoxicillin and lansoprazole can pass into breast milk and may harm a nursing baby. You should not breast-feed while using this medicine.
This medicine is not approved for use by anyone younger than 18 years old.
How should I take Prevpac?
Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Each dose of this combination medicine contains 4 pills (3 capsules and 1 tablet). Take all 4 pills twice daily before you eat, unless your doctor tells you otherwise.
Do not crush, chew, break, or open the pills. Swallow each pill whole. You may swallow the pills one at a time.
Use this medicine for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Skipping doses may also increase your risk of further infection that is resistant to antibiotics. This medicine will not treat a viral infection such as the flu or a common cold.
This medicine can cause unusual results with certain lab tests for glucose (sugar) in the urine. Tell any doctor who treats you that you are using Prevpac.
Store at room temperature, away from moisture, heat, and light.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking Prevpac?
This medicine can cause diarrhea, which may be a sign of a new infection. If you have diarrhea that is watery or bloody, call your doctor. Do not use anti-diarrhea medicine unless your doctor tells you to.
Prevpac side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
diarrhea that is watery or bloody;
liver problems--nausea, upper stomach pain, itching, tired feeling, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
kidney problems--urinating more or less than usual, blood in your urine, swelling, rapid weight gain;
signs of inflammation in your body--swollen glands, flu symptoms, easy bruising or bleeding, severe tingling or numbness, muscle weakness, chest pain, new or worsening cough with fever, trouble breathing; or
severe skin reaction--fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.
Serious side effects may be more likely in older adults.
Common side effects may include:
vaginal itching or discharge;
nausea, vomiting, stomach pain;
unusual or unpleasant taste in the mouth; or
discolored teeth, black or "hairy" tongue.
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.
See also: Side effects (in more detail)
What other drugs will affect Prevpac?
A gout medicine called colchicine (Colcrys) can interact with clarithromycin and cause serious or life-threatening medical problems. You should not take colchicine during your treatment with Prevpac, especially if you are an older adult with kidney disease.
Many other drugs can interact with clarithromycin. Not all possible interactions are listed here. Tell your doctor about all your medications and any you start or stop using during treatment with Prevpac, especially:
This list is not complete and many other drugs can interact with Prevpac. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Give a list of all your medicines to any healthcare provider who treats you.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Copyright 1996-2018 Cerner Multum, Inc. Version: 5.02.
More about Prevpac (amoxicillin / clarithromycin / lansoprazole)
- Side Effects
- During Pregnancy
- Dosage Information
- Drug Interactions
- Support Group
- Pricing & Coupons
- En Español
- 55 Reviews – Add your own review/rating
- Generic Availability
- Drug class: H. pylori eradication agents