Olanzapine: Wikis

  
  

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Olanzapine
Systematic (IUPAC) name
2-methyl-4-(4-methyl-1-piperazinyl)-
10
H-thieno[2,3-b][1,5]benzodiazepine
Identifiers
CAS number 132539-06-1
ATC code N05AH03
PubChem 4585
DrugBank APRD00138
ChemSpider 10442212
Chemical data
Formula C17H20N4S 
Mol. mass 312.439
SMILES eMolecules & PubChem
Physical data
Melt. point 195 °C (383 °F)
Solubility in water Practically insoluble in water mg/mL (20 °C)
Pharmacokinetic data
Bioavailability 87% [1]
Metabolism Hepatic (direct glucuronidation and CYP mediated oxidation)
Half life 21–54 hours
Excretion urine 57%, feces 30%
Therapeutic considerations
Pregnancy cat. C
Legal status Prescription only
Routes oral, intramuscular
 Yes check.svgY(what is this?)  (verify)
Zyprexa.PNG

Olanzapine (trade names Zyprexa, Zyprexa Zydis, Zalasta, Zolafren, Olzapin, Rexapin or in combination with fluoxetine Symbyax) is an atypical antipsychotic, approved by the FDA for the treatment of schizophrenia and bipolar disorder.[2] The olanzapine formulations are manufactured and marketed by the pharmaceutical company Eli Lilly and Company, whose patent for olanzapine proper expires in 2011 (in October 2009 a Canadian judge ruled that the 1991 patent was invalid).[3] Sales of Zyprexa in 2008 were $2.2B in the US alone, and $4.7B in total.[4]

Contents

Indications and Usage

  • oral formulation: acute and maintenance treatment of Schizophrenia in adults, acute treatment of manic or mixed episodes associated with Bipolar I Disorder (monotherapy and in combination with lithium or valproate)
  • intramuscular formulation: acute agitation associated with Schizophrenia and Bipolar I Mania in adults
  • oral formulation combined with fluoxetine: acute treatment of depressive episodes associated with Bipolar I Disorder in adults, or acute treatment of treatment resistant depression in adults [5]

Known FDA approvals are as follows:

  • approved for the treatment of the manifestations of psychotic disorders on September 6, 1996[6]
  • approved in combination with fluoxetine for the treatment of depressive episodes associated with Bipolar disorder on December 24, 2003[7]
  • approved for the long-term treatment of bipolar I disorder on January 14, 2004[8]
  • approved in combination with fluoxetine for treatment resistant depression on March 19, 2009.[9]

Off-label uses

Case-reports, open-label, and small pilot studies suggest efficacy of olanzapine for the treatment of some anxiety spectrum disorders (e.g. generalized anxiety disorder,[10] panic disorder,[11] post-traumatic stress disorder[12]); however, olanzapine has not been rigorously evaluated in randomized, placebo-controlled trials for this use and is not FDA approved for these indications. Other common off-label uses of olanzapine include the treatment of eating disorders (e.g. anorexia nervosa) and as an adjunctive treatment for major depressive disorder without psychotic features. It has also been used for Tourette syndrome and stuttering.[citation needed] Olanzapine is also used in many addiction clinics as a sleep aid (usually 2.5–5 mg) due to its low abuse profile and zero addictive properties.[13]

Prevention of psychosis

Olanzapine has been considered as part of an early psychosis approach for schizophrenia. The Prevention through Risk Identification, Management, and Education (PRIME) study, funded by the National Institute of Mental Health and Eli Lilly, tested the hypothesis that olanzapine might prevent the onset of psychosis in people at very high risk for schizophrenia. The study examined 60 patients with prodromal schizophrenia, who were at an estimated risk of 36–54% of developing schizophrenia within a year, and treated half with olanzapine and half with placebo.[14] In this study, patients receiving olanzapine had a lower risk of progressing to psychosis, although the difference did not reach statistical significance. Olanzapine was effective for treating the prodromal symptoms, but was associated with significant weight gain.[15]

Use in elderly

Citing an increased risk of stroke, in 2004 the Committee on the Safety of Medicines (CSM) in the UK issued a warning that olanzapine and risperidone, both atypical antipsychotic medications, should not be given to elderly patients with dementia. In the U.S., olanzapine comes with a black box warning for increased risk of death in elderly patients. It is not approved for use in patients with dementia-related psychosis.[16] However, a BBC investigation in June 2008 found that this warning was being widely ignored by doctors.[17]

Dosage and administration

Olanzapine is available as a tablet in strengths of 2.5 mg, 5 mg, 7.5 mg, 10 mg, 15 mg and 20 mg. It also comes as an orally disintegrating wafer (known as Zydis), which dissolves on the tongue, in strengths of 5 mg, 10 mg, 15 mg and 20 mg. It is also available as a 10 mg vial for a rapid-acting intramuscular injection for short-term acute use.

Dose may be adjusted depending on the person' response to the drug. The dose also will depend on certain medical problems the person may have. It is generally recommended to be taken once daily before bed as it is highly sedating. However, sedation tends to diminish as treatment is pursued.

Pharmacology

Olanzapine is structurally similar to clozapine, but is classified as a thienobenzodiazepine. Olanzapine has a higher affinity for 5-HT2 serotonin receptors than D2 dopamine receptors.

Like most atypical antipsychotics, compared to the older typical ones, olanzapine has a lower affinity for histamine, cholinergic muscarinic and alpha adrenergic receptors. Olanzapine also exhibits weak affinity for GABAA, BZD receptor site[18] which may contribute slightly to its sedating properties.[19] The mode of action of olanzapine's antipsychotic activity is unknown. It may involve antagonism at serotonin receptors. Antagonism of dopamine receptors is associated with extrapyramidal effects such as tardive dyskinesia, and with therapeutic effects. Antagonizing H1 histamine receptors causes sedation and may cause weight gain, although antagonistic actions at 5-HT2C receptors have also been implicated in weight gain.

Metabolism

Olanzapine is metabolized by the cytochrome P450 system isoenzymes 1A2 and 2D6 (minor pathway). Drug metabolism may be decreased or increased by agents that induce (e.g. cigarette smoke) or inhibit (e.g. fluvoxamine or ciprofloxacin) CYP1A2 activity respectively.

Side effects, adverse reactions

As with all neuroleptic drugs, olanzapine can cause tardive dyskinesia and rare, but life-threatening, neuroleptic malignant syndrome.

Other recognised side effects may include:

Metabolic effects

The Food and Drug Administration requires all atypical antipsychotics to include a warning about the risk of developing hyperglycemia and diabetes, both of which are factors in the metabolic syndrome. These effects may be related to the drugs' ability to induce weight gain, although there are some reports of metabolic changes in the absence of weight gain.[citation needed] Of all the atypical antipsychotics, olanzapine is one of the most likely to induce weight gain based on various measures.[21][22][23][24] The effect is not dose dependent. Olanzapine may directly affect adipocyte function, promoting fat deposition.[25] There are some case reports of olanzapine-induced diabetic ketoacidosis.[26] Olanzapine may decrease insulin sensitivity[27] though one 3-week study seems to refute this.[28] It may also increase triglyceride levels.[22]

Despite weight gain, a large multi-center randomized National Institute of Mental Health study found that olanzapine was better at controlling symptoms because patients were more likely to remain on olanzapine than the other drugs.[29] One small, open-label, non-randomized study suggest that taking olanzapine by orally dissolving tablets may induce less weight gain,[30] but this has not been substantiated in a blinded experimental setting.

Animal studies

In a placebo-compared study of six Macaque monkeys receiving olanzapine between 17 and 27 months, a significant brain volume and weight decreases (8-11%) were detected.[31] In latter studies of the stored samples, the changes were attributed to astrocyte and oligodendrocyte loss,[32] with the neurons spared but positioned more closely compared to the controls. However according to this study the neurons does not seem to be completeley spared. The gray matter shrinking found was 14.6%, but the neuron density increase was only 10.2% which corresponds to approximately a loss of 5% of the neurons.[citation needed]

Overdose

Symptoms of an overdose include tachycardia, agitation, dysarthria, decreased consciousness and coma. Death has been reported after an acute overdose of 450 mg, but also survival after an acute overdose of 1500 mg.[33] There is no specific, known antidote for olanzapine overdose, and even physicians are recommended to call a certified poison control center for information on the treatment of such a case.[33]

Controversy, lawsuits and settlements

According to a New York Times article published on December 17, 2006,[34] "Eli Lilly has engaged in a decade-long effort to play down the health risks of Zyprexa, its best-selling medication for schizophrenia, according to hundreds of internal Lilly documents and e-mail messages among top company managers", most of which had been disclosed as the result of lawsuits by individuals who had taken the drug against the company though some had been stolen.[35] These had been sent to a number of journalists by a lawyer advocate for individuals with a psychiatric diagnosis opposed to forced psychiatric treatment. Eli Lilly filed a protection order to stop the dissemination of certain Eli Lilly documents about Zyprexa which they, and the judge, believed to be confidential and "not generally appropriate for public consumption".[35] Temporary injunctions required those who had been received the documents to return them and that the documents be removed from websites which had posted them.[36] In his final judgement, Judge Weinstein issued a permanent judgement against further dissemination of the documents and requiring their return by a number of parties named by Lilly.[35] These health risks include an increased risk for diabetes through Zyprexa's links to obesity and its tendency to raise blood sugar. Zyprexa is Lilly’s top-selling drug, with sales of $4.2 billion last year.

The documents, given to The New York Times by Jim Gottstein, show that Lilly executives kept important information from doctors about Zyprexa’s links to obesity and its tendency to raise blood sugar — both known risk factors for diabetes. The Times of London also obtained copies of the documents and reported that as early as October 1998, Lilly considered the risk of drug-induced obesity to be a "top threat" to Zyprexa sales.[37] In another document, dated October 9, 2000, senior Lilly research physician Robert Baker noted that an academic advisory board he belonged to was "quite impressed by the magnitude of weight gain on olanzapine and implications for glucose."[37]

Lilly’s own published data, which it told its sales representatives to play down in conversations with doctors, has shown that 30 percent of patients taking Zyprexa gain 22 pounds or more after a year on the drug, another study showed 16% of Zyprexa patients gained at least 30 kg (66 pounds) in one year, and some patients have reported gaining 100 pounds or more. But Lilly was concerned that Zyprexa’s sales would be hurt if the company was more forthright about the fact that the drug might cause unmanageable weight gain or diabetes, according to the documents, which cover the period 1995 to 2004. In 2006, Lilly paid $700 million to settle 8,000 lawsuits from people who said they had developed diabetes or other diseases after taking Zyprexa. Thousands more suits are still pending.[38]

In 2002, British and Japanese regulatory agencies warned that Zyprexa may be linked to diabetes, but even after the FDA issued a similar warning in 2003, Lilly did not publicly disclose their own findings.

Eli Lilly agreed on January 4, 2007 to pay up to $500 million to settle 18,000 lawsuits from people who claimed they developed diabetes or other diseases after taking Zyprexa. Including earlier settlements over Zyprexa, Lilly has now agreed to pay at least $1.2 billion to 28,500 people who claim they were injured by the drug. At least 1,200 suits are still pending, the company said. About 20 million people worldwide have taken Zyprexa since its introduction in 1996.[39] On January 8, 2007, Judge Jack B. Weinstein refused the Electronic Frontier Foundation's motion to stay his order.[40]

On January 15, 2009 Eli Lilly plead guilty to a misdemeanor charge of illegally marketing Zyprexa for off-label use, and agreed to pay $1.4 billion.[41] Although Lilly had evidence that it is not effective for dementia, Zyprexa was marketed for elderly Alzheimer's patients.[42] The drug carries an F.D.A. warning that it increases the risk of death in older patients with dementia-related psychosis.[43]

In order to make up for the costs for settling the lawsuits and shrinking sales figures for Zyprexa in the U.S.A. the company increased the prices for this medication in Germany in May 2007 by 18 percent. [44][45]

Chemistry

http://www.google.com/patents/about?id=ZGYeAAAAEBAJ&dq=US+5229382 Olanzapine synthesis.png

See also

Notes and references

  1. ^ Burton, Michael E.; Shaw, Leslie M.; Schentag, Jerome J.; Evans, William E. (May 1, 2005). Applied Pharmacokinetics & Pharmacodynamics: Principles of Therapeutic Drug Monitoring. Lippincott Williams & Wilkins; Fourth Edition edition. pp. 815. ISBN 978-0781744317. 
  2. ^ "Olanzapine Prescribing Information" (PDF). Eli Lilly and Company. 2009-03-19. http://pi.lilly.com/us/zyprexa-pi.pdf. Retrieved 2009-09-06. 
  3. ^ Pharmalot.com
  4. ^ "Lilly 2008 Annual Report" (PDF). Lilly. 2009. http://files.shareholder.com/downloads/LLY/696621960x0x296463/611E167A-61C9-4C03-8866-ACF5FA7C8953/English.PDF. Retrieved 2009-08-06. 
  5. ^ treatment resistant depression defined as Major Depressive Disorder in adult patients who do not respond to two separate trials of different antidepressants of adequate dose and duration in the current episode
  6. ^ "NDA 20-592" (PDF). Food and Drug Administration. 1996-09-06. http://www.accessdata.fda.gov/drugsatfda_docs/nda/96/020592_Original_Approval_Pkg%20.pdf. Retrieved 2009-09-06. 
  7. ^ "NDA 21-520" (PDF). Food and Drug Administration. 2003-12-24. http://www.accessdata.fda.gov/drugsatfda_docs/appletter/2003/21520ltr.pdf. Retrieved 2009-09-06. 
  8. ^ "NDA 20-592 / S-019" (PDF). Food and Drug Administration. 2004-01-14. http://www.accessdata.fda.gov/drugsatfda_docs/appletter/2004/20592se1-019ltr.pdf. Retrieved 2009-09-06. 
  9. ^ Forbes.com
  10. ^ Pollack MH, Simon NM, Zalta AK, Worthington JJ, Hoge EA, Mick E, Kinrys G, Oppenheimer J. (2006). "Olanzapine augmentation of fluoxetine for refractory generalized anxiety disorder: a placebo controlled study.". Biol Psychiatry. 59 (3): 211–5. doi:10.1016/j.biopsych.2005.07.005. PMID 16139813. 
  11. ^ Sepede G, De Berardis D, Gambi F, Campanella D, La Rovere R, D'Amico M, Cicconetti A, Penna L, Peca S, Carano A, Mancini E, Salerno RM, Ferro FM. (2003). "Olanzapine augmentation in treatment-resistant panic disorder: a 12-week, fixed-dose, open-label trial.". J Clin Psychopharmacol. 107 (5): 394–6. PMID 16415705. 
  12. ^ Jakovljević M, Sagud M, Mihaljević-Peles A. (2006). "Olanzapine in the treatment-resistant, combat-related PTSD—a series of case reports.". Acta Psychiatrica Scandinavica 26 (1): 45–9. doi:10.1111/j.1600-0447.1951.tb10961.x. PMID 12752037. 
  13. ^ "Antiphyscotic used as sleeping pill". http://www.forbes.com/2004/09/08/cx_mh_0908seroquel.html. Retrieved 2005-12-11. 
  14. ^ McGlashan, T.H.; et al. (1 May 2003). "The PRIME North America randomized double-blind clinical trial of olanzapine versus placebo in patients at risk of being prodromally symptomatic for psychosis. I. Study rationale and design". Schizophrenia Research (Amsterdam: Elsevier) 61 (1): 7–18. doi:10.1016/S0920-9964(02)00439-5. PMID 12648731. 
  15. ^ McGlashan, Thomas H.; et al. (May 2006). "Randomized, double-blind trial of olanzapine versus placebo in patients prodromally symptomatic for psychosis". American Journal of Psychiatry (Arlington, VA: American Psychiatric Association) 163 (5): 790–99. doi:10.1176/appi.ajp.163.5.790. PMID 16648318. http://ajp.psychiatryonline.org/cgi/content/full/163/5/790. Retrieved 2007-12-03. 
  16. ^ "Important Safety Information for Olanzapine". Zyprexa package insert. Eli Lilly & Company. 2007. http://zyprexa.com/common_pages/safety.jsp. Retrieved 2007-12-03. "Elderly patients with dementia-related psychosis treated with atypical antipsychotic drugs are at an increased risk of death compared to placebo. [...] ZYPREXA (olanzapine) is not approved for the treatment of elderly patients with dementia-related psychosis." 
  17. ^ "Doctors 'ignoring drugs warning'". BBC News. 17 June 2008. http://news.bbc.co.uk/1/hi/programmes/file_on_4/7457132.stm. Retrieved 2008-06-22. 
  18. ^ RXlist.com
  19. ^ Cancer.gov Definition of Olanzapine - National Cancer Institute
  20. ^ Makkos Z, Csonka A (December 2006). "[Akathisia in the course of olanzapine treatment]" (in Hungarian). Neuropsychopharmacol Hung 8 (4): 215–7. PMID 17211056. 
  21. ^ Moyer, Paula (2005-10-25). "CAFE Study Shows Varying Benefits Among Atypical Antipsychotics". Medscape Medical News (WebMD). http://www.medscape.com/viewarticle/515435. Retrieved 2007-12-03. 
  22. ^ a b AstraZeneca Pharmaceuticals (4 April 2006). "Efficacy and Tolerability of Olanzapine, Quetiapine and Risperidone in the Treatment of First Episode Psychosis: A Randomised Double Blind 52 Week Comparison". AstraZeneca Clinical Trials. AstraZeneca PLC. http://www.astrazenecaclinicaltrials.com/Article/526695.aspx. Retrieved 2007-12-03. "At week 12, the olanzapine-treated group had more weight gain, a higher increase in [ body mass index ], and a higher proportion of patients with a BMI increase of at least 1 unit compared with the quetiapine and risperidone groups (p<=0.01)." 
  23. ^ Wirshing DA, Wirshing WC, Kysar L, Berisford MA. (1999) Novel antipsychotics: comparison of weight gain liabilities. Journal of Clinical Psychology 60 358-63
  24. ^ National Institute of Mental Health (19 September 2005). "NIMH study to guide treatment choices for schizophrenia". Press release. http://www.eurekalert.org/pub_releases/2005-09/niom-nst091905.php. Retrieved 2006-12-18. 
  25. ^ Engl J, Rettenbacher M, Fleischhacker WW, Ebenbichler CF (2007). "Atypical antipsychotic drugs directly impair insulin action in adipocytes: effects on glucose transport, lipogenesis, and antilipolysis.". Neuropsychopharmacology. Nov;32(11):2431-2; author reply 2433-4. 32 (11): 2431–2. 
  26. ^ Fulbright, April R. (2006). "Complete Resolution of Olanzapine-Induced Diabetic Ketoacidosis" (abstract). Journal of Pharmacy Practice (Thousand Oaks, CA: SAGE Publications) 19 (4): 255–258. doi:10.1177/0897190006294180. http://jpp.sagepub.com/cgi/content/abstract/19/4/255. Retrieved 2007-12-02. "Olanzapine has been associated with diabetic ketoacidosis and also with weight gain, lipid abnormalities, and the development of type 2 diabetes.". 
  27. ^ Sacher J, Mossaheb N, Spindelegger C, Klein N, Geiss-Granadia T, Sauermann R, Lackner E, Joukhadar C, Müller M, Kasper S. (2008). "Effects of olanzapine and ziprasidone on glucose tolerance in healthy volunteers.". Neuropsychopharmacology 33 (7): 1633–41. 
  28. ^ Sowell, Margaret; et al. (August 8, 2003). "Evaluation of Insulin Sensitivity in Healthy Volunteers Treated with Olanzapine, Risperidone, or Placebo: A Prospective, Randomised Study Using the Two-Step Hyperinsulinemic, Euglycemic Clamp". Journal of Clinical Endocrinology & Metabolism (The Endocrine Society) 88 (12): 5875–5880. doi:10.1210/jc.2002-021884. PMID 14671184. http://jcem.endojournals.org/cgi/content/full/88/12/5875. Retrieved 2007-12-02. "In summary, this study did not demonstrate significant changes in insulin sensitivity in healthy subjects after 3 wk of treatment with olanzapine or risperidone.". 
  29. ^ Carey, Benedict (September 20, 2005). "Little Difference Found in Schizophrenia Drugs". New York Times (The New York Times Company). http://www.nytimes.com/2005/09/20/health/psychology/20drug.html. Retrieved 2007-12-03. 
  30. ^ de Haan L, van Amelsvoort T, Rosien K, Linszen D (2004). "Weight loss after switching from conventional olanzapine tablets to orally disintegrating olanzapine tablets". Psychopharmacology (Berl) 175 (3): 389–90. doi:10.1007/s00213-004-1951-2. PMID 15322727. 
  31. ^ Dorph-Petersen KA, Pierri JN, Perel JM, Sun Z, Sampson AR, Lewis DA (September 2005). "The influence of chronic exposure to antipsychotic medications on brain size before and after tissue fixation: a comparison of haloperidol and olanzapine in macaque monkeys". Neuropsychopharmacology 30 (9): 1649–61. doi:10.1038/sj.npp.1300710. PMID 15756305. 
  32. ^ Konopaske GT, Dorph-Petersen KA, Sweet RA, Pierri JN, Zhang W, Sampson AR, Lewis DA (April 2008). "Effect of chronic antipsychotic exposure on astrocyte and oligodendrocyte numbers in macaque monkeys". Biol. Psychiatry 63 (8): 759–65. doi:10.1016/j.biopsych.2007.08.018. PMID 17945195. PMC 2386415. http://linkinghub.elsevier.com/retrieve/pii/S0006-3223(07)00847-5. 
  33. ^ a b "Symbyax (Olanzapine and fluoxetine) drug overdose and contraindication information". RxList: The Internet Drug Index. WebMD. 2007. http://www.rxlist.com/cgi/generic/symbyax_od.htm. Retrieved 2007-12-03. 
  34. ^ The New York Times December 17, 2006
  35. ^ a b c U:\Cases\Civil L-Z\In re Zyprexa\Documents Leak\Injunction Memo & Order\FINAL INJUNCTION MEMO 2.13.07.wpd
  36. ^ EFF.org
  37. ^ a b Eli Lilly was Concerned by Zyprexa Side-Effects from 1998, The Times (London), January 23, 2007
  38. ^ NYtimes.com Mother Wonders if Psychosis Drug Helped Kill Son, New York Times, January 4, 2007
  39. ^ NYtimes.com Lilly to Pay Up to $500 Million to Settle Claims. The New York Times, January 4, 2007
  40. ^ Press Releases: January, 2007 | Electronic Frontier Foundation
  41. ^ MSN.com Lilly settles Zyprexa suit for $1.42 billion. The Associated Press, January 15, 2009
  42. ^ Cronin Fisk, Martha, Lopatto, Elizabeth and Feeley, Jef (June 1, 2009). "Lilly Sold Drug for Dementia Knowing It Didn’t Help, Files Show". Bloomberg L.P.. http://www.bloomberg.com/apps/news?pid=20601109&sid=aTLcF3zT1Pdo. Retrieved 2009-09-03. 
  43. ^ Berenson, Alex (December 18, 2006). "Drug Files Show Maker Promoted Unapproved Use". The New York Times. http://www.nytimes.com/2006/12/18/business/18drug.ht. Retrieved 2009-09-03. 
  44. ^ Frontal21.ZDF.de, Tödliche Nebenwirkungen? - Umstrittenes Medikament bringt satte Gewinne
  45. ^ YouTube.com, Zyprexa - Umstrittenes Medikament bringt satte Gewinne

External links

Manufacturer site

Consumer information

  • MedLibrary.org - 'Information on Zyprexa and How to Use It, Precautions and Other Medications to Avoid While Taking, MedLibrary
  • NIH.gov - 'Olanzapine (Systemic)' Drug Information, MedlinePlus

Controversy








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