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Prevpac Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Prevpac (lansoprazole, amoxicillin and clarithromycin) is used to prevent stomach ulcer caused by infection with Helicobacter pylori (H. pylori). It is a combination of lansoprazole (Prevacid), a proton pump inhibitor (PPI), amoxicillin, a penicillin antibiotic, and clarithromycin, a macrolide antibiotic. Common side effects include diarrhea, headache, nausea, vomiting, and abnormal taste.
The recommended adult oral dose is 30 mg lansoprazole (Prevacid), 1 g amoxicillin, and 500 mg clarithromycin administered together twice daily (morning and evening) for 10 or 14 days. Prevpac may interact with HIV/AIDS medications, blood thinners, clopidogrel, cyclosporine, digoxin, iron supplements, fluconazole or ketoconazole, probenecid, rifabutin, sildenafil, tacrolimus, theophylline, sulfa drugs, cholesterol-lowering medicines, heart rhythm medications, sedatives, seizure medications, or tetracycline antibiotics. Tell your doctor all prescription and over-the-counter medications and supplements you use. During pregnancy, Prevpac should be used only when prescribed. Amoxicillin passes into breast milk. It is unknown if lansoprazole or clarithromycin pass into breast milk. Consult your doctor before breast-feeding.
Our Prevpac (lansoprazole, amoxicillin and clarithromycin) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
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.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Prevpac in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
- diarrhea that is watery or bloody;
- signs of new infection, such as fever, chills, body aches, flu symptoms, mouth sores;
- easy bruising or bleeding, unusual weakness;
- agitation, confusion, unusual thoughts or behavior;
- dizziness, fainting, fast or pounding heartbeat; 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.
Less serious side effects may include:
- unusual or unpleasant taste in your mouth;
- nausea, vomiting, stomach pain;
- constipation, dark colored stools;
- dry mouth, increased thirst; or
- vaginal itching or discharge.
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.
Read the entire detailed patient monograph for Prevpac (Lansoprazole, Amoxicillin and Clarithromycin)
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Prevpac Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these rare but very serious side effects occur: muscle weakness, dark urine, yellowing eyes/skin, easy bruising/bleeding, signs of infection (such as fever, persistent sore throat), mental/mood changes (such as agitation, confusion).
Seek immediate medical attention if any of these rare but very serious side effects occur: severe dizziness, fainting, fast/irregular heartbeat.
This medication may rarely cause a severe intestinal condition (Clostridium difficile-associated diarrhea) due to a type of resistant bacteria. This condition may occur during treatment or weeks to months after treatment has stopped. Do not use anti-diarrhea products or narcotic pain medications if you have any of the following symptoms because these products may make them worse. Tell your doctor immediately if you develop: persistent diarrhea, abdominal or stomach pain/cramping, blood/mucus in your stool.
Use of this medication for prolonged or repeated periods may result in oral thrush or a new yeast infection. Contact your doctor if you notice white patches in your mouth, a change in vaginal discharge, or other new symptoms.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing, kidney problems (such as change in the amount of urine).
Amoxicillin can commonly cause a mild rash that is usually not serious. However, you may not be able to tell it apart from a rare rash that could be a sign of a severe allergic reaction. Therefore, seek immediate medical attention if you develop any rash.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Prevpac (Lansoprazole, Amoxicillin and Clarithromycin)
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Prevpac FDA Prescribing Information: Side Effects
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.
The most common adverse reactions ( ≥ 3%) reported in clinical trials when all three components of this therapy were given concomitantly for 14 days are listed in Table 5.
Table 5: Adverse Reactions
Most Frequently Reported in Clinical Trials ( ≥ 3%)
|Adverse Reaction||Triple Therapy|
The additional adverse reactions which were reported as possibly or probably related to treatment (less than 3%) in clinical trials when all three components of this therapy were given concomitantly are listed below and divided by body system:
Body as a Whole-abdominal pain
Nervous System-confusion, dizziness
Respiratory System-respiratory disorders
Skin and Appendages -skin reactions
Urogenital System -vaginitis, vaginal moniliasis
There were no statistically significant differences in the frequency of reported adverse events between the 10-and 14-day triple therapy regimens.
The following adverse reactions from the labeling for PREVACID are provided for information:
Worldwide, over 10,000 patients have been treated with PREVACID in Phase 2 or Phase 3 clinical trials involving various dosages and durations of treatment. In general, PREVACID treatment has been well-tolerated in both short-term and long-term trials.
Incidence in Clinical Trials
The following adverse events were reported by the treating physician to have a possible or probable relationship to drug in 1% or more of PREVACID-treated patients and occurred at a greater rate in PREVACID-treated patients than placebo-treated patients:
Table 6: Incidence of Possibly or Probably
Treatment-Related Adverse Reactions in Short-Term, Placebo-Controlled PREVACID
|Body System/Adverse Event||PREVACID
(N= 2768) %
(N= 1023) %
|Body as a Whole|
Headache was also seen at greater than 1% incidence but was more common on placebo. The incidence of diarrhea was similar between patients who received placebo and patients who received 30 mg of PREVACID, but higher in the patients who received 60 mg of PREVACID (2.9%, 4.2%, and 7.4%, respectively).
The most commonly reported possibly or probably treatment-related adverse event during maintenance therapy was diarrhea.
Additional adverse experiences occurring in less than 1% of patients or subjects who received
PREVACID in domestic trials are shown below:
Body as a Whole- abdomen enlarged, allergic reaction, asthenia, back pain, candidiasis, carcinoma, chest pain (not otherwise specified), chills, edema, fever, flu syndrome, halitosis, infection (not otherwise specified), malaise, neck pain, neck rigidity, pain, pelvic pain
Cardiovascular System- angina, arrhythmia, bradycardia, cerebrovascular accident/cerebral infarction, hypertension/hypotension, migraine, myocardial infarction, palpitations, shock (circulatory failure), syncope, tachycardia, vasodilation
Digestive System -abnormal stools, anorexia, bezoar, cardiospasm, cholelithiasis, colitis, dry mouth, dyspepsia, dysphagia, enteritis, eructation, esophageal stenosis, esophageal ulcer, esophagitis, fecal discoloration, flatulence, gastric nodules/fundic gland polyps, gastritis, gastroenteritis, gastrointestinal anomaly, gastrointestinal disorder, gastrointestinal hemorrhage, glossitis, gum hemorrhage, hematemesis, increased appetite, increased salivation, melena,mouth ulceration, nausea and vomiting, nausea and vomiting and diarrhea, gastrointestinal moniliasis, rectal disorder, rectal hemorrhage, stomatitis, tenesmus, thirst, tongue disorder, ulcerative colitis, ulcerative stomatitis
Nervous System - abnormal dreams, agitation, amnesia, anxiety, apathy, confusion, convulsion, dementia, depersonalization, depression, diplopia, dizziness, emotional lability, hallucinations, hemiplegia, hostility aggravated, hyperkinesia, hypertonia, hypesthesia, insomnia, libido decreased/increased, nervousness, neurosis, paresthesia, sleep disorder, somnolence, thinking abnormality, tremor, vertigo
Respiratory System - asthma, bronchitis, cough increased, dyspnea, epistaxis, hemoptysis, hiccup, laryngeal neoplasia, lung fibrosis, pharyngitis, pleural disorder, pneumonia, respiratory disorder, upper respiratory inflammation/infection, rhinitis, sinusitis, stridor
Skin and Appendages - acne, alopecia, contact dermatitis, dry skin, fixed eruption, hair disorder, maculopapular rash, nail disorder, pruritus, rash, skin carcinoma, skin disorder, sweating, urticaria
Special Senses - abnormal vision, amblyopia, blepharitis, blurred vision, cataract, conjunctivitis, deafness, dry eyes, ear/eye disorder, eye pain, glaucoma, otitis media, parosmia, photophobia, retinal degeneration/disorder, taste loss, taste perversion, tinnitus, visual field defect
Urogenital System - abnormal menses, breast enlargement, breast pain, breast tenderness, dysmenorrhea, dysuria, gynecomastia, impotence, kidney calculus, kidney pain, leukorrhea, menorrhagia, menstrual disorder, penis disorder, polyuria, testis disorder, urethral pain, urinary frequency, urinary retention, urinary tract infection, urinary urgency, urination impaired, vaginitis
Additional adverse experiences have been reported since PREVACID has been marketed. The majority of these cases are foreign-sourced and a relationship to PREVACID has not been established. Because these events were reported voluntarily from a population of unknown size, estimates of frequency cannot be made. These events are listed below by COSTART body system:
Body as a Whole - anaphylactic/anaphylactoid reactions
Digestive System - hepatotoxicity, pancreatitis, vomiting
Infections and infestations - Clostridium Difficile associated diarrhea
Metabolism and Nutritional Disorders - hypomagnesemia
Musculoskeletal System - bone fracture, myositis
Special Senses - speech disorder
The following adverse reactions from the labeling for amoxicillin are provided for information:
As with other penicillins, it may be expected that untoward reactions will be essentially limited to sensitivity phenomena. They are more likely to occur in individuals who have previously demonstrated hypersensitivity to penicillins and in those with a history of allergy, asthma, hay fever, or urticaria. The following adverse reactions have been reported as associated with the use of penicillins:
Infections and Infestations - Mucocutaneous candidiasis
Hypersensitivity Reactions - Anaphylaxis (see WARNINGS), serum sickness-like reactions, erythematous maculopapular rashes, erythema multiforme, Stevens-Johnson Syndrome, exfoliative dermatitis, toxic epidermal necrolysis, acute generalized exanthematous pustulosis, hypersensitivity vasculitis and urticaria have been reported.
Liver - A moderate rise in AST (SGOT) and/or ALT (SGPT) has been noted, but the significance of this finding is unknown. Hepatic dysfunction including cholestatic jaundice, hepatic cholestasis and acute cytolytic hepatitis have been reported.
Renal - Crystalluria has also been reported (see OVERDOSAGE).
Hemic and Lymphatic Systems - Anemia, including hemolytic anemia, thrombocytopenia, thrombocytopenic purpura, eosinophilia, leukopenia and agranulocytosis have been reported during therapy with penicillins. These reactions are usually reversible on discontinuation of therapy and are believed to be hypersensitivity phenomena.
Central Nervous System - Reversible hyperactivity, agitation, anxiety, insomnia, confusion, behavioral changes, and/or dizziness have been reported rarely.
Miscellaneous - Tooth discoloration (brown, yellow, or gray staining) has been rarely reported. Most reports occurred in pediatric patients. Discoloration was reduced or eliminated with brushing or dental cleaning in most cases.
The following adverse reactions from the labeling for clarithromycin are provided for information:
The majority of adverse reactions observed in clinical trials were of a mild and transient nature. Fewer than 3% of adult patients without mycobacterial infections discontinued therapy because of drug-related side effects.
The most frequently reported events in adults were diarrhea (3%), nausea (3%), abnormal taste (3%), dyspepsia (2%), abdominal pain/discomfort (2%), and headache (2%). Most of these events were described as mild or moderate in severity. Of the reported adverse events, only 1% was described as severe.
The following post-marketing adverse reactions from the labeling for clarithromycin are provided for information:
Allergic reactions ranging from urticaria and mild skin eruptions to cases of anaphylaxis, Stevens-Johnson syndrome, drug rash with eosinophilia and systemic symptoms (DRESS), Henoch-Schonlein Purpura and toxic epidermal necrolysis have occurred. Other spontaneously reported adverse reactions include glossitis, stomatitis, oral moniliasis, anorexia, vomiting, pancreatitis, tongue discoloration, thrombocytopenia, leukopenia, neutropenia, dizziness, myalgia and hemorrhage. There have been reports of tooth discoloration in patients treated with clarithromycin. Tooth discoloration is usually reversible with professional dental cleaning. There have been isolated reports of hearing loss, which is usually reversible, occurring chiefly in elderly women. Reports of alterations of the sense of smell including smell loss, usually in conjunction with taste perversion or taste loss have also been reported.
Transient CNS events including anxiety, behavioral changes, confusional states, convulsions, depersonalization, disorientation, hallucinations, insomnia, depression, manic behavior, nightmares, psychosis, tinnitus, tremor, and vertigo have been reported during postmarketing surveillance. Events usually resolve with discontinuation of the drug.
Adverse reactions related to hepatic dysfunction have been reported in postmarketing experience with clarithromycin (see WARNINGS, Hepatotoxicity).
There have been reports of interstitial nephritis coincident with clarithromycin use.
There have been post-marketing reports of colchicine toxicity with concomitant use of clarithromycin and colchicine, especially in the elderly, some of which occurred in patients with renal insufficiency. Deaths have been reported in some such patients (see WARNINGS and PRECAUTIONS).
There have been cases of rhabdomyolysis reported with clarithromycin use. In some cases, clarithromycin was administered concomitantly with other drugs known to be associated with rhabdomyolysis (such as statins, fibrates, colchicine or allopurinol).
The following changes in laboratory parameters in patients who received PREVACID were reported as adverse reactions:
Abnormal liver function tests, increased SGOT (AST), increased SGPT (ALT), increased creatinine, increased alkaline phosphatase, increased globulins, increased GGTP, increased/decreased/abnormal WBC, abnormal AG ratio, abnormal RBC, bilirubinemia, blood potassium increased, blood urea increased, crystal urine present, eosinophilia, hemoglobin decreased, hyperlipemia, increased/decreased electrolytes, increased/decreased cholesterol, increased glucocorticoids, increased LDH, increased/decreased/abnormal platelets, increased gastrin levels and positive fecal occult blood. Urine abnormalities such as albuminuria, glycosuria, and hematuria were also reported.
In the placebo-controlled studies, when SGOT (AST) and SGPT (ALT) were evaluated, 0.4% (4/978) and 0.4% (11/2677) patients, who received placebo and PREVACID, respectively, had enzyme elevations greater than three times the upper limit of normal range at the final treatment visit. None of these patients who received PREVACID reported jaundice at any time during the study.
Changes in laboratory values due to clarithromycin with possible clinical significance were as follows:
Hepatic - elevated SGPT (ALT) < 1%, SGOT (AST) < 1%, GGT < 1%, alkaline phosphatase < 1%, LDH < 1%, total bilirubin < 1%
Hematologic - decreased WBC < 1%, elevated prothrombin time 1%
Renal - elevated BUN 4%, elevated serum creatinine < 1%
GGT, alkaline phosphatase, and prothrombin time data are from adult studies only.
Read the entire FDA prescribing information for Prevpac (Lansoprazole, Amoxicillin and Clarithromycin)
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