lansoprazole
Brand names: Prevacid
Lansoprazole is a medicine that reduces the amount of acid in your stomach. It belongs to a class of drugs called proton pump inhibitors (PPIs).
Drug Pricing (NADAC)
Brand Price
$0.55/unit
Generic Price
$0.16/unit
Generic Savings
71%
Generic Available
Yes (17 manufacturers)
Pricing data from NADAC (CMS), effective December 18, 2024. Compare all drug costs →
What it does
Lansoprazole can treat several conditions caused by too much stomach acid.
Common side effects
Diarrhea, Abdominal pain, Nausea
Key warnings
Lansoprazole may hide the symptoms of stomach cancer.
How It Works
Lansoprazole works by blocking the enzyme in the stomach that produces acid. This helps to lower the amount of acid made. Lowering acid helps to heal damage and relieve symptoms.
How to Take It
Take lansoprazole capsules by swallowing them whole. The dose depends on your condition, so follow your doctor's orders. For H. pylori, you may need to take other medicines with lansoprazole. If you have trouble swallowing, ask your doctor about other ways to take it.
Pregnancy & Breastfeeding
Talk to your doctor if you are pregnant or plan to become pregnant. Lansoprazole may affect bone development in the fetus. If you take lansoprazole with clarithromycin, also consider clarithromycin's pregnancy risks.
Missed Dose
If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule.
Storage
Store lansoprazole capsules at room temperature, between 68°F and 77°F.
Side Effects (from patient reports)
Based on 124,917 FDA adverse event reports.
FDA Adverse Event Report Analysis
Detailed analysis of 173,086 reports from the FDA Adverse Event Reporting System (FAERS). Reports span 1997–2025.
Total Reports
173,086
Death-Related Reports
19,347
Hospitalization Reports
62,821
Top Indication
Product Used For Unknown Indication
Gender Distribution
Age Distribution
Most Reported Adverse Reactions (FAERS)
| # | Reaction | Reports |
|---|---|---|
| 1 | CHRONIC KIDNEY DISEASE | 32,775 |
| 2 | ACUTE KIDNEY INJURY | 18,670 |
| 3 | RENAL FAILURE | 13,811 |
| 4 | END STAGE RENAL DISEASE | 9,782 |
| 5 | RENAL INJURY | 9,520 |
| 6 | NAUSEA | 8,964 |
| 7 | DIARRHOEA | 8,752 |
| 8 | DYSPNOEA | 7,945 |
| 9 | FATIGUE | 7,633 |
| 10 | VOMITING | 7,064 |
| 11 | OFF LABEL USE | 6,868 |
| 12 | HEADACHE | 6,742 |
| 13 | PAIN | 6,733 |
| 14 | DRUG INEFFECTIVE | 6,440 |
| 15 | DIZZINESS | 6,013 |
Reactions in Death Reports
Reactions in Hospitalization Reports
Source: FDA FAERS (Adverse Event Reporting System) FDA FAERS (Adverse Event Reporting System) Reports are voluntary and do not establish causation
Serious Warnings
Lansoprazole may hide the symptoms of stomach cancer. If you have a poor response or early return of symptoms, your doctor may do more tests. Long-term use of PPIs like lansoprazole may increase your risk of bone fractures. It may also cause low magnesium levels or Vitamin B-12 deficiency.
Known Drug Interactions
Combination Therapy with Clarithromycin and Amoxicillin Clinical Impact: Concomitant administration of clarithromycin with other drugs can lead to serious adverse reactions, including potentially fatal arrhythmias, and are contraindicated. Amoxicillin also has drug interactions. See Drug Interactions in prescribing information for amoxicillin.
Mechanism: Using these drugs together as part of a treatment plan can increase the risk of side effects or change how other medicines work.
What to do: Check with your doctor to make sure this combination is safe with your other medications.
Combination Therapy with Clarithromycin and Amoxicillin Clinical Impact: Concomitant administration of clarithromycin with other drugs can lead to serious adverse reactions, including potentially fatal arrhythmias, and are contraindicated. Intervention : See Contraindications and Warnings and Precautions in prescribing information for clarithromycin.
Mechanism: Clarithromycin can cause serious and potentially fatal heart rhythm problems when combined with certain other drugs.
What to do: Your doctor must check for heart risks before you take these medicines together.
Clinically Relevant Interactions Affecting Lansoprazole Delayed Release Capsules When CoAdministered with Other Drugs CYP2C19 OR CYP3A4 Inducers Clinical Impact: Decreased exposure of lansoprazole when used concomitantly with strong inducers [ see Clinical Pharmacology ( 12.3 )] Intervention : St John’s Wort, rifampin : Avoid concomitant use with Lansoprazole.
Mechanism: Rifampin causes the body to break down lansoprazole too quickly, which makes the medicine less effective.
What to do: Avoid taking these two medications at the same time.
Mild or Moderate CYP3A Inhibitors: Clotrimazole, antibiotics (e.g., verapamil, diltiazem, nifedipine, nicardipine), amiodarone, danazol, ethinyl estradiol, cimetidine, lansoprazole and omeprazole May increase tacrolimus whole blood trough concentrations and increase the risk of serious adverse reactions (e.g., neurotoxicity, QT prolongation) [see Warnings and Precautions ( 5.7 , 5.10 , 5.11 )] .
Mechanism: Lansoprazole makes it harder for your body to get rid of tacrolimus. This can cause the medicine to build up to unsafe levels in your system.
What to do: Your healthcare provider should monitor your blood levels frequently. They may need to lower your tacrolimus dose to prevent serious side effects.
Warfarin Clinical Impact: Increased INR and prothrombin time in patients receiving PPIs and warfarin concomitantly. Dose adjustment of warfarin may be needed to maintain target INR range. See prescribing information for warfarin.
Mechanism: Lansoprazole can change how your body handles warfarin, which can make your blood thinner than it should be.
What to do: Your doctor should check your blood clotting levels more often and may need to adjust your warfarin dose.
Common Questions
Can I crush or chew the lansoprazole capsule?
How long does it take for lansoprazole to work?
Can I take lansoprazole with other medications?
What should I do if I experience side effects?
Can I take lansoprazole long-term?
Is lansoprazole safe for children?
Can lansoprazole cause diarrhea?
Does lansoprazole interact with food?
Can lansoprazole cause headaches?
What if lansoprazole doesn't relieve my symptoms?
What are the common side effects of lansoprazole?
Does lansoprazole interact with other medications?
What drug class is lansoprazole?
Is there a generic version of lansoprazole?
Is lansoprazole safe during pregnancy?
Has lansoprazole been recalled?
Active Recalls
CGMP Deviations: product held outside appropriate storage temperature conditions.
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Related Medications in Proton Pump Inhibitor (PPI)
Other drugs grouped near lansoprazole — same-class peers and common alternatives.
alosetron
Lotronex
Alosetron (Lotronex) is a medicine for women with severe diarrhea-predominant irritable bowel syndrome (IBS).
Compare with lansoprazole →
aprepitant
Emend
Aprepitant (Emend) is a medicine that helps prevent nausea and vomiting.
Compare with lansoprazole →
bisacodyl
Dulcolax
Bisacodyl is a medicine that helps you have a bowel movement.
Compare with lansoprazole →
bismuth subsalicylate
Pepto-Bismol
Bismuth subsalicylate (Pepto-Bismol) is a medicine that can treat diarrhea and upset stomach.
Compare with lansoprazole →
cimetidine
Tagamet
Cimetidine (Tagamet) reduces stomach acid.
Compare with lansoprazole →
Medication Guides
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What the FDA Data Shows for lansoprazole
The FDA label for lansoprazole (sold under brand names such as Prevacid) classifies it as an over-the-counter product in the Proton Pump Inhibitor (PPI) class. Lansoprazole can treat several conditions caused by too much stomach acid. Official labeling lists 4 commonly reported side effects, including Diarrhea, Abdominal pain, Nausea.
Post-market surveillance from the FDA Adverse Event Reporting System (FAERS) captures real-world experience. For this drug, FAERS contains 124,917 voluntary reports. The database also lists 14 documented drug interactions derived from FDA labeling, with the top-flagged interaction rated major severity. NADAC pricing from CMS shows a generic unit cost of $0.16 versus $0.55 for the brand — a 71% generic savings.
Report counts do not establish causation — a FAERS entry documents a temporal association, not proof that the drug produced the outcome. Widely prescribed medications naturally accumulate more reports than niche therapies, so raw totals must be interpreted alongside total exposure. Shortage status, recall history (currently 1 recall record on file), and patent information further shape supply and switching decisions. This page summarizes public FDA data for educational purposes only and is not a substitute for professional medical advice — always consult a licensed healthcare provider before starting, stopping, or changing any medication.
Data Sources
Drug labeling: FDA Drug Labels (SPL/DailyMed). Adverse events: FDA Adverse Event Reporting System (FAERS). Pricing: CMS National Average Drug Acquisition Cost (NADAC).
FAERS reports are voluntary and do not establish causation. Drug interactions are derived from FDA labeling and clinical references. Always consult a healthcare professional before making medication decisions.
Last updated: April 15, 2022
Read our methodology — how this data is sourced, computed, and verified.
All federal data sources used on this page
- FDA Orange Book — approved drug products with therapeutic equivalence. accessdata.fda.gov/cder/ob
- FDA DailyMed — NIH-hosted drug labeling for FDA-approved meds. dailymed.nlm.nih.gov
- FDA Adverse Event Reporting System (FAERS) — post-marketing safety surveillance. fda.gov/drugs/faers
- NLM RxNorm — standardized clinical drug nomenclature. nlm.nih.gov/research/umls/rxnorm
- CMS Medicare Part B Drug Average Sales Price Files — federal drug pricing data. cms.gov/medicare/part-b-drugs/asp
- FDA Drug Shortages Database — current and resolved drug shortage tracking. accessdata.fda.gov/drugshortages