Lansoprazole, Clarithromycin, and Amoxicillin

Lansoprazole, Clarithromycin, And Amoxicillin
Lansoprazole, Clarithromycin, And Amoxicillin


Lansoprazole, clarithromycin, and amoxicillin are used to treat and prevent the return of ulcers (sores in the lining of the stomach or intestine) caused by a certain type of bacteria (H. pylori). Lansoprazole is in a class of medications called proton pump inhibitors.

Clarithromycin and amoxicillin are in a class of medications called antibiotics. Lansoprazole works by decreasing the amount of acid made in the stomach. Clarithromycin and amoxicillin work by stopping the growth of the bacteria that may cause ulcers. Antibiotics will not work for colds, flu, or other viral infections.

Side Effects Of Lansoprazole, Clarithromycin, and Amoxicillin

Lansoprazole, clarithromycin, and amoxicillin may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • diarrhea
  • stomach pain or cramps
  • vomiting
  • nausea
  • change in ability to taste food
  • headache
  • dizziness

Some side effects can be serious. If you experience any of the following symptoms, call your doctor immediately:

  • blistering or peeling skin
  • rash
  • hives`
  • swelling of the face, eyes, lips, tongue, arms, or legs
  • difficulty breathing or swallowing
  • hoarseness
  • sore throat, fever, chills, and other signs of infection
  • watery or bloody diarrhea with or without stomach pain that occurs during your treatment or for up to 2 months afterward
  • yellow eyes or skin, loss of appetite, dark urine; itching, abdominal pain, unexplained bruising or bleeding, or loss of appetite
  • increased heart rate, dizziness, and seizures

Lansoprazole, amoxicillin, and clarithromycin may cause other side effects. Call your doctor if you have any unusual problems while you are taking these medications.

Warnings & Precautions

Before taking lansoprazole, clarithromycin, and amoxicillin:

  • tell your doctor and pharmacist if you are allergic to any antibiotics azithromycin (Zithromax, Zmax), clarithromycin (Biaxin), erythromycin (E.E.S. 400, others), cephalosporins such as cefaclor, cefadroxil, cefuroxime (Ceftin, Zinacef), and cephalexin (Keflex); other beta-lactam antibiotics such as penicillin or amoxicillin (Amoxil, Moxatag); lansoprazole (Prevacid); any other medications; or any of the ingredients in amoxicillin tablets, clarithromycin capsules, or lansoprazole capsules. Ask your pharmacist for a list of the ingredients.
  • tell your doctor if you are taking any of the following medications: astemizole (Hismanal) (not available in the U.S.), cisapride (Propulsid) (not available in the U.S.), colchicine (Colcyrs, Mitigare), dihydroergotamine (D.H.E, Migranal), ergotamine (Ergomar, in Cafergot, in Migergot), lovastatin (Advicor, Altoprev), pimozide (Orap), quetiapine (Seroquel), rilpivirine (Edurant), simvastatin (Zocor, in Simcor, in Vytorin), or terfenadine (Seldane) (not available in the U.S.). Your doctor will probably tell you not to take lansoprazole, clarithromycin, and amoxicillin if you are taking one or more of these medications.
  • tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: amiodarone (Nexterone, Pacerone); other antibiotics such as ampicillin; anticoagulants (‘blood thinners’) such as warfarin (Coumadin, Jantoven); certain antifungal medications including itraconazole (Onmel, Sporanox), ketoconazole, and voriconazole (Vfend); certain benzodiazepines including alprazolam (Niravam, Xanax), midazolam, and triazolam (Halcion); bromocriptine (Cycloset, Parlodel); certain calcium channel blockers such as amlodipine (Norvasc), diltiazem (Cardizem, Dilacor), nifedipine (Adalat, Procardia), and verapamil (Calan, Verelan, others); carbamazepine (Carbatrol, Epitol, Equetro, Tegretol, Teril); certain cholesterol-lowering medications including atorvastatin (Lipitor) and pravastatin (Pravachol); cilostazol (Pletal); cyclosporine (Gengraf, Neoral, Sandimmune); dasatinib (Sprycel); digoxin (Lanoxin); disopyramide (Norpace); dofetilide (Tikosyn); erlotinib (Tarceva); certain medications for HIV such as atazanavir Reyataz), didanosine (Videx), efavirenz (Sustiva), etravirine (Intelence), nelfinavir (Viracept), nevirapine (Viramune), ritonavir (Norvir, in Kaletra), saquinavir (Invirase), and zidovudine (Retrovir, in Trizivir, in Combivir); insulin; iron supplements; maraviroc (Selzentry); methylprednisolone (Medrol); methotrexate (Otrexup, Rasuvo, Xatmep); mycophenolate (Cellcept); nateglinide (Starlix); nilotinib (Tasigna); phenobarbital; phenytoin (Dilantin, Phenytek); pioglitazone (Actos); probenecid (Probalan, in Col-probenecid); procainamide; quinidine (in Nuedexta); repaglinide (Prandin); rifabutin (Mycobutin); rifampin (Rifadin, Rimactane); rifapentine (Priftin); rosiglitazone (Avandia); sildenafil (Revatio, Viagra); sotalol (Betapace, Sorine); tacrolimus (Astagraf XL, Prograf); tadalafil (Adcirca, Cialis); theophylline (Theo 24, Theochron, Uniphyl, others); tolterodine (Detrol); valproate (Depacon); vardenafil (Levitra, Staxyn); and vinblastine. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. Many other medications may also interact with lansoprazole, clarithromycin, and amoxicillin, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list.
  • if you are taking sucralfate (Carafate), take it 30 minutes after you take lansoprazole, clarithromycin, and amoxicillin.
  • tell your doctor what herbal products you are taking, especially St. John’s wort.
  • tell your doctor if you have or have ever had QT prolongation (an irregular heart rhythm that can lead to fainting, loss of consciousness, seizures, or sudden death) or an irregular heartbeat; low levels of potassium or magnesium in your blood; asthma, allergies, hives, hay fever, myasthenia gravis (a disease that causes muscle weakness); or kidney or liver disease.
  • tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while taking these medications, call your doctor.
  • if you are having surgery, including dental surgery, tell your doctor or dentist that you are taking lansoprazole, clarithromycin, and amoxicillin.

Dosage Of Lansoprazole, Clarithromycin, and Amoxicillin

  • Lansoprazole comes as a delayed-release (releases the medication in the intestine to prevent break-down of the medication by stomach acids) capsule, clarithromycin comes as a tablet, and amoxicillin comes as a capsule, all to be taken by mouth. These medications are usually taken before a meal twice a day. To help you take the right number of capsules and tablets at each dose, the medication is packaged in dosing cards. Each dosing card contains all of the medication needed for both daily doses. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take the medication exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
  • Swallow the tablets and capsules whole; do not split, chew, or crush them.
  • Take lansoprazole, clarithromycin, and amoxicillin until you finish the prescription, even if you feel better. If you stop taking antibiotics too soon your infection may not be completely treated and the bacteria may become resistant to antibiotics.

If your condition does not improve or gets worse, call your doctor.


Keep all appointments with your doctor and the laboratory. Do not let anyone else take your medication. Your prescription is probably not refillable. If you still have symptoms after you finish your prescription, call your doctor.

Before having any laboratory test, tell your doctor and the laboratory personnel that you are taking lansoprazole, clarithromycin, and amoxicillin.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.


All information has been provided courtesy of MedLinePlus from the National Library of Medicine and from the FDA.