|Systematic (IUPAC) name|
|Licence data||US FDA:|
|Pregnancy cat.||B3 (AU) B (US)|
|Legal status||POM (UK) OTC (US)|
|Bioavailability||80% or more|
|Metabolism||Hepatic (CYP3A4- and CYP2C19-mediated)|
|Excretion||Renal and fecal|
|Mol. mass||369.363 g/mol|
| (what is this?)
Lansoprazole (pron.: // lan-SOH-prə-zohl; INN) is a proton-pump inhibitor (PPI) which inhibits the stomach's production of gastric acids. 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.
Lansoprazole has been available as a generic drug since Prevacid patent protection expired on November 10, 2009. Since 2009 Lansoprazole has been available over the counter (OTC) in the U.S. in a 15 mg dose marketed by Novartis as Prevacid 24HR.
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. Lansoprazole is a racemate [1:1-mixture of the enantiomers dexlansoprazole (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 is not proportional to the duration of the drug's effects to the person (i.e. gastric acid suppression). The mean plasma elimination half-life is 1.5 hours, and the effects of the drug last for over 24 hours after it has been used for 1 day or more. Lansoprazole, 30 mg administered nasogastrically, effectively controls intragastric pH and is an alternative to i.v. pantoprazole in patients who are unable to swallow solid dosage formulations.
|This section does not cite any references or sources. (November 2009)|
Lansoprazole is indicated for:
- Treatment of ulcers of the stomach and duodenum, and NSAID-induced ulcers.
- Adjunctive treatment of Helicobacter pylori infection, alongside antibiotics. Treatment to kill Helicobacter pylori (H. pylori) causing ulcers or other problems involves using two other drugs besides lansoprazole. This treatment is known as "triple therapy", and involves taking twice daily for 10 or 14 days lansoprazole 30 mg, amoxicillin 1,000 mg, and clarithromycin 500 mg.
- Treatment of gastroesophageal reflux disease (GERD) (also known as acid reflux disease).
- Treatment of Zollinger-Ellison Syndrome.
Drug interactions 
Lansoprazole interacts with several other drugs, either due to its own nature or as a proton pump inhibitor.
- 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, amongst other drugs:
Side effects 
- 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)
- Severe: Gastro-intestinal disturbances (such as nausea 1.3%, abdominal pain 2.1%, diarrhea 3.8%).
Proton-pump inhibitors may be associated with a greater risk of hip fractures and Clostridium difficile-associated diarrhea. Antacid preparations such as lansoprazole by suppressing acid mediated break down of proteins, leads to an elevated risk of developing food and drug allergies. This happens due to undigested proteins then passing into the gastrointestinal tract where sensitisation occurs. It is unclear whether this risk occurs with only long-term use or with short-term use as well. Patients are frequently administered the drugs in intensive care as a protective measure against ulcers, but this use is also associated with a 30% increase in occurrence of pneumonia.
Brand names 
The drug is also sold under several brand names, including:
- Agopton (Germany)
- Digest (Indonesia)
- Duogast (Syria)
- GERD (Pakistan)
- Gastrolan (Indonesia)
- Lanciprol (Greece)
- Lansazol (Jordan)
- Lansobene (Austria)
- Lansoloc (South Africa)
- Lansoprazol (Denmark)
- Lansoptol (Hungary)
- Lansor (Turkey)
- Lansox (Italy)
- Lanston LFDT (South Korea)
- Lenzo (India)
- Lanzol (India, Ireland)
- Lanzotec (Jordan)
- Lanzul (Romania/Slovenia)
- Lanton (Israel)
- Lanzo (Sweden)
- Lanzopral (Argentina, Chile, Peru, Venezuela)
- Lanzor (France, South Africa)
- Lanzostad (Lithuania, Latvia, Estonia)
- Laprazol (Greece)
- Limpidex (Italy)
- Monolitum (Spain)
- Ogast and OgastORO (France)
- Ogastro (Mexico)
- Prevacid (U.S. and Canada)
- Prosogan and Prosogan FD (Indonesia)
- pro-ulco (Spain)
- Refluxon (Hungary)
- Sabax (Serbia)
- SOLOX (New Zealand)
- Takepron (Japan)
- Zolt (Finland)
- Zoton (Italy, Ireland, Australia, UK)
- ZOMEL (Ireland)
- Lanzap (Romania)
- Levant (Romania)
- Lantrea (Poland)
- Mosby's Drug Consult: Lansoprazole
- Prevacid drug patents
- Teva to release Prevacid version when patent expires
- "Novartis launches Prevacid 24HR over-the-counter for full 24-hour frequent heartburn treatment" (PDF) (Press release). November 12, 2009. Retrieved 2009-11-13.
- "Prevacid 24HR Patient Package Insert" (PDF). November 12, 2009. Retrieved 2009-11-13.
- "Novartis launches Prevacid 24HR over-the-counter for full 24-hour frequent heartburn treatment" (Press release). November 12, 2009. Retrieved 2009-11-13.
- http://www.mainecarepdl.org/index.pl/genpharmfiles/memos-and-mailings/pharmacy-benefit-update-summer-fall-2009.pdf[dead link]
- "Prevacid Pharmacology, Pharmacokinetics, Studies, Metabolism". RxList.com. 2007. Retrieved 2007-04-14.
- "Prevacid 24HR Fact Sheet" (PDF). November 12, 2009. Retrieved 2009-11-13.
- Effects on 24-Hour Intragastric pHFreston M.D., Ph.D., James; Yi-Lin Chiu, Ph.D., Wei-Jian Pan, Ph.D., Nancy Lukasik, B.S.N., and Jörg Täubel, M.D., A.F.P.M. (2001). "Effects on 24-Hour Intragastric pH: A Comparison of Lansoprazole Administered Nasogastrically in Apple Juice and Pantoprazole Administered Intravenously". American Journal of Gastroenterology 96 (7): 2058–2065. doi:10.1111/j.1572-0241.2001.03939.x. ISSN 0002-9270. OCLC 440925790. PMID 11467632. Unknown parameter
- British National Formulary (Free registration required) Lansoprazole interactions
- Antimicrob Agents Chemother. 1991 September; 35(9): 1765–1771. Effects of ranitidine and sucralfate on ketoconazole bioavailability. S C Piscitelli, T F Goss, J H Wilton, D T D'Andrea, H Goldstein, and J J Schentag 
- British National Formulary (Free registration required) 1.3.5 Proton pump inhibitors
- British National Formulary (Free registration required) Lansoprazole
- K C Singhal & S Z Rahman, Lansoprazole Induced Adverse Effects on the Skin, Indian Medical Gazette, July 2001, Vol. CXXXV. N0. 7: 223-225
- Sterry W, Assaf C (2007). "Erythroderma". In Bolognia JL. Dermatology. St. Louis: Mosby. p. 154. ISBN 1-4160-2999-0..
- Yang YX, Lewis JD, Epstein S, Metz DC (December 2006). "Long-term proton pump inhibitor therapy and risk of hip fracture". JAMA 296 (24): 2947–53. doi:10.1001/jama.296.24.2947. PMID 17190895.
- "Proton pump inhibitors and Clostridium difficile". Bandolier. 2003. Retrieved 2007-07-13.
- Pali-Schöll I, Jensen-Jarolim E (April 2011). "Anti-acid medication as a risk factor for food allergy". Allergy 66 (4): 469–77. doi:10.1111/j.1398-9995.2010.02511.x. PMID 21121928.
- Herzig SJ, Howell MD, Ngo LH, Marcantonio ER (May 2009). "Acid-suppressive medication use and the risk for hospital-acquired pneumonia". JAMA 301 (20): 2120–8. doi:10.1001/jama.2009.722. PMID 19470989.
- "Vastaavat tuotteet - hintavertailu" (in Finnish).
- "FASS.se, accessed 2010-02-13" (in Swedish).
- 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