|Trade names||Prevacid, others|
|by mouth, IV|
|Drug class||proton pump inhibitor|
|Bioavailability||80% or more|
|Metabolism||Hepatic (CYP3A4- and CYP2C19-mediated)|
|Elimination half-life||1–1.5 hours|
|Excretion||Renal and fecal|
|Chemical and physical data|
|Molar mass||369.363 g/mol|
|3D model (JSmol)|
Lansoprazole, sold under the brand name Prevacid among others, is a medication which inhibits the stomach's production of acid. There is no evidence that its effectiveness is different from that of other PPIs. Lansoprazole, given through a nasogastric tube, effectively controls pH inside the stomach and is an alternative to intravenous pantoprazole in people who are unable to swallow solid-dose formulations.
Lansoprazole is a proton-pump inhibitor (PPI) in the same pharmacologic class as omeprazole. Lansoprazole has been marketed for many years and is one of several PPIs available. It is a racemic 1:1 mixture of the enantiomers dexlansoprazole (Dexilant, formerly named Kapidex) and levolansoprazole. Dexlansoprazole is an enantiomerically pure active ingredient of a commercial drug as a result of the enantiomeric shift. Lansoprazole's plasma elimination half-life (1.5 h) is not proportional to the duration of the drug's effects to the person (i.e. gastric acid suppression). The effects of the medication last for over 24 hours after it has been used for a day or more.
It is manufactured by a number of companies worldwide under several brand names. In the United States, it was first approved by the Food and Drug Administration (FDA) in 1995. Prevacid patent protection expired on November 10, 2009.
Lansoprazole is used for treatment of:
- Ulcers of the stomach and duodenum, and NSAID-induced ulcers
- Helicobacter pylori infection, alongside antibiotics (adjunctive treatment), treatment to kill H. pylori causing ulcers or other problems involves using two other drugs besides lansoprazole known as "triple therapy", and involves taking twice daily for 10 or 14 days lansoprazole, amoxicillin, and clarithromycin
- Gastroesophageal reflux disease
- Zollinger-Ellison syndrome
There is no good evidence that it works better than other PPIs.
- Common: diarrhea, abdominal pain
- Infrequent: dry mouth, insomnia, drowsiness, blurred vision, rash, pruritus
- Rarely and very rarely: taste disturbance, liver dysfunction, peripheral oedema, hypersensitivity reactions (including bronchospasm, urinary, angioedema, anaphylaxis), photosensitivity, fever, sweating, depression, interstitial nephritis, blood disorders (including leukopenia, leukocytosis, pancytopenia, thrombocytopenia), arthralgia, myalgia, skin reactions including (erythroderma Stevens–Johnson syndrome, toxic epidermal necrolysis, bullous eruption)
Lansoprazole interacts with several other drugs, either due to its own nature or as a PPI.
- PPIs reduce absorption of antifungals (itraconazole and ketoconazole)  and possibly increase digoxin in plasma
- Increases plasma concentrations of cilostazol (risk of toxicity)
Lansoprazole possibly interacts with, among other drugs:
- iron salts
- aminophylline and theophylline
Society and culture
In vitro experiments have shown that lansoprazole binds to the pathogenic form of tau protein. As of 2015 laboratory studies were underway on analogs of lansoprazole to explore their use as potential PET imaging agents for diagnosing tauopathies including Alzheimer's disease. Lansoprazole is also a prodrug that targets the cytochrome bc1 complex of Mycobacterium tuberculosis once converted to lansoprazole sulfide in mycobacterial host cells.
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- British National Formulary (Free registration required) Lansoprazole
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- "Novartis launches Prevacid 24HR over-the-counter for full 24-hour frequent heartburn treatment" (PDF) (Press release). November 12, 2009. Retrieved November 13, 2009.
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- Prevacid official website Takeda Pharmaceuticals North America
- Prevacid 24HR official website Novartis Consumer Health
- Prevpac official website Takeda Pharmaceuticals North America
- U.S. National Library of Medicine: Drug Information Portal - Lansoprazole