lansoprazole/amoxicillin/clarithromycin (Rx)

Brand and Other Names:Prevpac
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Dosing & Uses


Dosage Forms & Strengths


capsule/capsule/tablet prepack

  • 30mg/500mg/500mg
  • amoxicillin component consists of 2 capsules (500 mg/capsule)

Duodenal Ulcer

Eradication of H. pylori to reduce risk of duodenal ulcer recurrence

Lansoprazole 30 mg, amoxicillin 1 g, clarithromycin 500 mg administered together PO twice daily (morning and evening) for 10 or 14 days

Each dose of this combination therapy contains 4 pills: 1 capsule lansoprazole 30 mg, 2 capsules amoxicillin 500 mg, and 1 tablet clarithromycin 500 mg

Prevpac is clearly labeled for administration of 1 dose (30 mg/1 g/500 mg) PO twice daily

Dosage Modifications

Severe renal impairment (CrCl <30 mL/min): Do not use

Hepatic impairment: Not dosage adjustment required

Safety and efficacy not established


Adverse Effects



  • GI effects, general (13%)



  • Headache (6%)
  • Rash (children 3%)
  • Abdominal pain (adults 2%, children 3%)
  • Abnormal taste (adults 3-7%)
  • Diarrhea (3-6%)
  • Dyspepsia (2%)
  • Heartburn (adults 2%)
  • GI intolerance (oral-dose related)
  • Nausea (adults 3-6%)
  • Vomiting (adults 1%; children 6%)
  • Decreased WBC, elevated BUN (4%), elevated PT (1%)


  • Fatigue (< 3%)
  • Headache (2.5-4.7%)
  • Abdominal pain (1.8%)
  • Diarrhea (8%)
  • Nausea (3.7%)



  • QT prolongation
  • Anxiety, dizziness, hallucinations, manic behavior, neuromuscular blockade, psychosis, seizures
  • Anorexia, glossitis, pancreatitis
  • AST increased, bilirubin increased, elevated LFTs, hepatic dysfunction, hepatitis, increased alkaline phosphate, jaundice
  • Hypoglycemia, leukopenia, neutropenia, thrombocytopenia
  • Increased serum creatinine
  • Dyspnea
  • Anaphylaxis, C Diff colitis, Stevens-Johnson syndrome

Frequency Not Defined


  • Headache
  • Rash
  • Diarrhea, nausea, vomiting
  • Anemia
  • AST/ALT elevation
  • Acute exanthematous pustulosis
  • Exfoliative dermatitis
  • Seizure
  • Insomnia
  • Hemorrhagic colitis
  • Toxic epidermal necrolysis
  • Urticaria
  • Stevens-Johnson syndrome
  • Anaphylaxis
  • Candidiasis (mucocutaneous), pseudomembranous colitis, serum sickness


  • Torsade de pointes (rare)
  • Allergic reactions: urticaria & skin eruptions, leukocytoclastic vasculitis, toxic epidermal necrolysis, pruritus, rash
  • Transient CNS effects: psychosis, anxiety, behavioral changes, confusional states, depersonalization, disorientation, hallucinations, insomnia, nightmares, tinnitus, tremor, and vertigo
  • Hepatic failure
  • Stomatitis
  • Acute renal failure
  • Reversible hearing loss (hypoacusis)




  • Hypersensitivity to lansoprazole or other proton pump inhibitors


  • History of severe hypersensitivity reactions (eg, anaphylaxis or Stevens-Johnson syndrome) to amoxicillin or other beta-lactam antibiotics (eg, penicillins and cephalosporins)
  • Infectious mononucleosis (relative)


  • Documented hypersensitivity
  • Clarithromycin/ranitidine bicitrate contraindicated in: severe renal impairment (CrCl<25 mL/min); history of acute porphyria
  • QT prolongation or ventricular cardiac arrhythmia, including torsades de pointes
  • Concomitant administration with HMG-CoA reductase inhibitors extensively metabolized by CYP3A4 (lovastatin or simvastatin); increases risk of myopathy, including rhabdomyolysis


Consider possibility of superinfections with fungal or bacterial pathogens during therapy; if superinfections occur, discontinue therapy and institute appropriate therapy


  • Liver disease may require dosage reduction
  • Published observational studies suggest that proton pump inhibitor (PPI) therapy may be associated with an increased risk for osteoporosis-related fractures of the hip, wrist, or spine; particularly with prolonged (>1 yr), high-dose therapy
  • Cutaneous lupus erythematosus (CLE) and systemic lupus erythematosus (SLE) reported with PPIs; avoid using for longer than medically indicated; discontinue if signs or symptoms consistent with CLE or SLE are observed and refer patient to specialist
  • Hypomagnesemia may occur with prolonged use (ie, >1 year); adverse effects may result and include tetany, arrhythmias, or seizures; in 25% of cases reviewed, magnesium supplementation alone did not improve low serum magnesium levels and the PPI had to be discontinued
  • PPIs possibly associated with increased incidence of Clostridium difficile-associated diarrhea (CDAD); consider diagnosis of CDAD for patients taking PPIs with diarrhea that does not improve
  • Symptomatic response to therapy with lansoprazole does not preclude the presence of gastric malignancy
  • PPIs may elevate and prolong methotrexate or its metabolite serum levels, possibly leading to toxicity


  • Allergy to cephalosporins, carbapenems
  • Endocarditis prophylaxis: use only for high risk pts, per recent AHA Guidelines
  • High doses may cause false urine glucose test by some methods


  • Caution in severe renal impairment
  • Do not refrigerate oral solution
  • Endocarditis prophylaxis: use only for high risk patients, per recent AHA Guidelines
  • Clarithromycin has been associated with prolongation of the QT interval and infrequent cases of arrhythmia
  • Concomitant use of clarithromycin and oral hypoglycemic agents and/or insulin can result in significant hypoglycemia
  • There is a risk of serious hemorrhage and significant elevations in INR and prothrombin time when clarithromycin is co-administered with warfarin; monitor INR and prothrombin times

Pregnancy & Lactation

Pregnancy category: C ( based on the pregnancy category for clarithromycin)

No adequate and well-controlled studies in pregnant women; do not use clarithromycin in pregnant women except in circumstances in which no alternative therapy is appropriate

Lactation: Caution should be exercised when clarithromycin is administered to nursing women; the development and health benefits of human milk feeding should be considered along with the mother’s clinical need for clarithromycin and any potential adverse effects on human milk- fed child from the drug or from underlying maternal condition

Pregnancy Categories

A:Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk.

B:May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk.

C:Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done.

D:Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk.

X:Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist.

NA:Information not available.



Mechanism of Action

Lamsoprazole: Proton pump inhibitor; binds to H+/K+-exchanging ATPase (proton pump) in gastric parietal cells resulting in blocking acid secretion

Amoxicillin: Inhibits bacterial cell wall synthesis by binding to one or more penicillin binding proteins that in turn inhibit the final transpeptidation step of peptoglycan synthesis in cell wall biosynthesis

Clarithromycin: Inhibits protein synthesis by binding to 50S ribosomal subunit causing antibacterial activity


Half-Life: 0.9-1.5 hr

Bioavailability: 81-91% (empty stomach); 50-70% (30 minutes after food)

Clearance Total Body: 0.7 L/hr/kg

Onset of action: 1-3 hr (gastric acid suppression)

Renal: 517 mL/min

Metabolism: Gastric parietal cells: acidic pH converts lansoprazole to its active sulfenamide metabolites

Liver: by hepatic CYP2C19; slow metabolizers are deficient in CPY2C19 enzyme & can have plasma conc can increase 5 times or higher

Metabolites Active: cyclic sulfenamide & disulfide metaboliteInactive: 5-hydroxy-lansoprazole, sulfide metabolite, omeprazole sulfone, sulfone metabolite, hydroxysulfide metabolite, hydroxysulfone metabolite

Excretion: Feces (bile): 77%

Urine: 14-25%

Peak Plasma Time: 1.5-3 hr

Protein Bound: 97-99%

Vd: 14-18 L

Dialyzable: No

Enzymes inhibited: CYP2C19


Half-Life: 3.7 hr (neonates, full term); 1-2 hr (infants and children); 0.7-1.4 hr (adults); 7-21 hr (CrCl < 10 mL/min in adults)

Absorption: 74-92%

Distribution: most body fluids and bone, CSF<1%

Peak Plasma Time: 2hr (capsule); 3.1 hr (extended release tablet); 1 hr (suspension)

Protein Bound: 17-20%

Metabolism: Partially hepatic

Excretion: Urine


Half-Life: 3-7 hr

Peak Plasma Time: 2-3 hr (immediate release); 5-8 hr (extended release)

Absorption: Highly stable in presence of gastric acid (unlike erythromycin); food delays but does not affect extent of absorption

Distribution: Widely into most body tissues except CNS

Protein binding: 42-70%

Metabolism: partially hepatic (P450 enzyme CYP3A4); converted to 14-OH clarithromycin (active metabolite)

Renal Clearance: approximates normal GFR

Excretion: primarily urine



Oral Administration

Contains enteric coated granules (acid labile); do not chew or crush





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Tier Description
1 This drug is available at the lowest co-pay. Most commonly, these are generic drugs.
2 This drug is available at a middle level co-pay. Most commonly, these are "preferred" (on formulary) brand drugs.
3 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs.
4 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs or specialty prescription products.
5 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs or specialty prescription products.
6 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs or specialty prescription products.
NC NOT COVERED – Drugs that are not covered by the plan.
Code Definition
PA Prior Authorization
Drugs that require prior authorization. This restriction requires that specific clinical criteria be met prior to the approval of the prescription.
QL Quantity Limits
Drugs that have quantity limits associated with each prescription. This restriction typically limits the quantity of the drug that will be covered.
ST Step Therapy
Drugs that have step therapy associated with each prescription. This restriction typically requires that certain criteria be met prior to approval for the prescription.
OR Other Restrictions
Drugs that have restrictions other than prior authorization, quantity limits, and step therapy associated with each prescription.
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