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Continuing Education Activity

Olanzapine is a second-generation (atypical) antipsychotic medication. The FDA has approved this medication for schizophrenia if the patient is over the age of 13 and bipolar disorder, including mixed or manic episodes. Olanzapine is also approved for use with fluoxetine, a selective serotonin reuptake inhibitor (SSRI), in patients with episodes of depression associated with bipolar disorder type 1 and treatment-resistant depression. It is important to note that olanzapine is not FDA-approved for patients under the age of 13. In addition, the combination of olanzapine with fluoxetine is not approved for patients under the age of 10. This activity covers olanzapine, including mechanism of action, pharmacology, adverse event profiles, eligible patient populations, contraindications, and monitoring, and highlights the role of the interprofessional team in the management of olanzapine therapy.


  • Identify the mechanism of action of olanzapine.
  • Summarize the approved and off-label indications for olanzapine therapy.
  • Review the adverse event profile for olanzapine.
  • Outline the importance of collaboration and communication among interprofessional team members to improve outcomes and treatment efficacy for patients who might benefit from therapy with olanzapine.
Access free multiple choice questions on this topic.


Olanzapine is a second-generation (atypical) antipsychotic medication. FDA has recently approved olanzapine in combination with samidorphan to attenuate olanzapine-induced weight gain. [1]

 FDA-approved Indications

  • Schizophrenia if the patient is over the age of 13 years
  • Bipolar I disorder, for acute treatment of manic or mixed episodes.
  • Olanzapine also has approval for use with fluoxetine, a selective serotonin reuptake inhibitor (SSRI), in patients with episodes of depression associated with bipolar disorder type 1 and treatment-resistant depression. It is essential to recognize that olanzapine is not FDA-approved for patients under the age of thirteen years. The combination of olanzapine with fluoxetine does not have approval for patients under the age of 10 years.[2]
  • The FDA has recently approved olanzapine in combination with samidorphan to attenuate olanzapine-induced weight gain for schizophrenia and bipolar I disorder.[1][3]

Off-label Clinical Uses

  • Acute agitation[4]
  • Anorexia nervosa[6]
  • Chemotherapy-induced nausea and vomiting (CINV)[7]

Mechanism of Action

Olanzapine is an atypical (second-generation) antipsychotic that exerts its action primarily on dopamine and serotonin receptors. It works on dopamine D2 receptors in the mesolimbic pathway as an antagonist, blocking dopamine from potential action at the post-synaptic receptor. Olanzapine binds loosely to the receptor and dissociates easily, allowing for normal dopamine neurotransmission.

The effect on the D2 receptors leads to a decrease in positive symptoms in patients, including hallucinations, delusions, and disorganized speech, thought, and behavior. Olanzapine works similarly on serotonin 5HT2A receptors in the frontal cortex as an antagonist.

The effect of olanzapine on serotonin decreases negative symptoms, including anhedonia, flat affect, alogia, avolition, and poor attention.[8]


Absorption: Daily administration of olanzapine leads to reaching the steady-state plasma concentration in about one week. The time to peak concentration is 6 hours for oral formulation and 15-45 minutes for IM formulation. Olanzapine has a half-life of 21 to 54 hours, with an average of 30 hours.[9]

Distribution: The volume of distribution is approximately 1000 liters, and the medication is distributed widely throughout the body. It is 93% bound to plasma proteins, primarily albumin and alpha-1 acid glycoprotein.

Metabolism: Olanzapine is extensively metabolized by the liver by glucuronidation and the cytochrome P450 system. This system's enzymes that metabolize olanzapine are primarily CYP1A2 and, minorly, CYP2D6. CYP1A2 genes are poly-morphic; however, a study showed no reported associations between various polymorphisms and pharmacokinetics of the medication.[10][11]

Excretion: The half-life of olanzapine is approximately 30 hours (varies between 21 to 54 hours). Olanzapine is excreted primarily via the renal route (57%) and feces (30%). 


A significant benefit of olanzapine is its multiple routes of administration, giving it potential use in many patients.

It is available in tablet form, which is beneficial in compliant patients who can take medications orally. The tablet form is available in 2.5 mg, 5 mg, 7.5 mg, 10 mg, 15 mg, and 20 mg dosages. In addition, olanzapine is also available in a disintegrating tablet form. This form is especially beneficial for patients who cannot swallow pills but wishes to take an oral form, patients who have an aversion to taking medications by not swallowing the tablet, or those who are agitated. The bioavailability of orodispersible forms has been found to be considerably greater than their standard dosage forms.

Olanzapine is also available in an injectable dosage of 5 mg/mL. This form may be best for the agitated patient who is not medication compliant and refuses or cannot swallow the oral formulation of the drug.

Clinicians should monitor patients for post-injection delirium/sedation syndrome with extended-release olanzapine injections.[12]

Use in Specific Patient Populations

Patients with Hepatic impairment: Patients with hepatic impairment do not require a dosage adjustment. Patients with Child-Pugh Classification A and B cirrhosis did not majorly influence the metabolism of this medication. Because of this extensive metabolism of olanzapine, only 7% of the drug remains unchanged upon excretion. However, olanzapine can increase aminotransferase levels; hence use with caution in patients with hepatic impairment.[13]

Patients with Renal Impairment: Patients with renal impairment do not require special dosing for this medication because of its metabolism.[14] However, it is important to recognize that olanzapine is not removed by hemodialysis.

Pregnancy Considerations: Extrapyramidal symptoms, feeding disorders, and respiratory distress have been documented in neonates exposed to olanzapine during the third trimester of pregnancy. Monitor neonates for extrapyramidal or withdrawal symptoms, as some neonates need prolonged hospitalization while others recover spontaneously. However, there is a risk to the pregnant mother from untreated schizophrenia or bipolar disorder, including the risk of relapse, deterioration leading to hospitalization, and suicide. Schizophrenia and bipolar disorder are also associated with increased adverse perinatal outcomes. Consequently, olanzapine may be used for bipolar disorders and schizophrenia, but the clinician needs to carefully evaluate the risk-benefit in consultation with an obstetrician and psychiatrist.[15]

Breastfeeding Considerations: Higher maternal doses of olanzapine produce low concentrations in human milk and trace levels in the serum of breastfed infants. Sedation is the major adverse drug reaction in infants. Systematic reviews of second-generation antipsychotics concluded that olanzapine is the preferred agent during breastfeeding.[16] In addition, a new safety scoring system (use of psychotropic drugs during lactation) finds olanzapine acceptable during breastfeeding.[17]

Pharmacogenetic Considerations: Smokers may need a 30% higher daily dose than nonsmokers due to CYP1A2 induction, per American Psychiatric Association(APA) guideline 2020.[9]

Adverse Effects

One of the most common adverse effects of olanzapine is the potential for weight gain. Olanzapine causes an increase in appetite leading to hyperphagia with a consequence of weight gain.[18] Therefore, it should be used cautiously in patients who are obese, have little control over their food intake, and do not exercise regularly to combat weight gain.[19]

Another adverse effect of olanzapine is the increased risk of metabolic effects. Olanzapine has a high potential to cause reduced insulin sensitivity, leading to impaired glucose tolerance, especially in a younger population.[20] While an exact mechanism for these adverse effects is still under debate, evidence suggests that the WNT signaling pathway effector TCF7L2 plays a vital role in glucose homeostasis. Olanzapine-induced weight gain and decreased insulin sensitivity lead to increased expression of TCF7L2 in the liver and skeletal muscle. Elevated insulin levels lead to increased expression of TCF7L2 in adipose tissue. This increased expression of TCF7L2 in multiple body tissues, which all play a role in glucose metabolism, suggests the mechanism for metabolic dysfunction caused by olanzapine. This finding also contributes to a possible therapeutic target to prevent or treat the adverse metabolic effects of olanzapine.[21]

Olanzapine's mechanism of action also lends itself to directly causing adverse reactions associated with the dopaminergic blockade. Patients have an increased risk of developing akathisia, extrapyramidal symptoms, tardive dyskinesia, and neuroleptic malignant syndrome. However, the risk of developing these side effects is lesser than first-generation antipsychotics due to the lower affinity and rapid dissociation of olanzapine with the D2 receptors.[8]

Hematological abnormalities such as neutropenia and thrombocytopenia are reported.[22][23] Post-marketing surveillance has also reported cases of hypothermia and edema due to olanzapine.[24]

Samidorphan, a μ-opioid receptor antagonist, is approved to reduce olanzapine-associated weight gain.[25][26]


Olanzapine is contraindicated in patients with a known hypersensitivity to this medication or medications in its class. There is a boxed warning for olanzapine regarding dementia-related psychosis. Elderly patients with dementia who present with symptoms of psychosis should not be prescribed olanzapine due to an increased mortality risk due to increased risk of heart failure, sudden death due to cardiac causes, and pneumonia.[27] Concomitant use of parenteral olanzapine(high dose) with benzodiazepines is not advised due to sedation and the risk of severe cardiorespiratory depression.[9] 

Additionally, due to the adverse effects of weight gain and metabolic dysfunction, clinicians should use this medication with caution in patients who are obese or have diabetes mellitus. However, using olanzapine is not an absolute contraindication in these patients.[18]


Monitoring blood glucose levels frequently and educating patients on exercise and diet should follow a prescription for olanzapine.[28] The optimal therapeutic window for olanzapine is 20 ng/mL to 40 ng/mL. A serum concentration of 80 ng/mL is the threshold for adverse reactions to olanzapine. Toxicology studies identified that postmortem serum levels of olanzapine were higher than antemortem levels, and high dosages of olanzapine were only lethal when combined with another drug.[29][30]

Clinicians should monitor patients while discontinuing olanzapine therapy, as there is a risk of physical withdrawal and rebound symptoms. Hence olanzapine should be tapered gradually.[31] Olanzapine (long-acting IM formulation): There is a risk of post-injection delirium syndrome with olanzapine; therefore, it must be administered in a registered health care facility with ready access to emergency services; the patient requires monitoring for at least 3 hours after administration.[9]


Olanzapine has a low potential for toxicity when prescribed alone. However, there are case reports which found olanzapine toxicity caused by high doses of the medication when taken in conjunction with other medicines. For example, a case report of a patient who overdosed by taking 560 milligrams of olanzapine in addition to 6.4 grams of propranolol and 280 milligrams of amlodipine had extreme hypotension, circulatory collapse, respiratory depression, and coma.[32]

According to the product labeling and postmarketing reports, the following are the features of olanzapine toxicity.[28]

Serum concentration of olanzapine >0.1 mg/L is toxic and serum concentration>1 mg/L can be fatal.[28]

Clinical Features

  • Agitation
  • Dysarthria
  • Tachycardia and hypotension
  • Extrapyramidal symptoms
  • Sedation 
  • Miosis[33]
  • Aspiration
  • Delirium
  • Respiratory depression
  • Coma
  • Convulsions
  • Ventricular dysrhythmia[34]


  • There is no specific antidote to olanzapine. In acute overdosage, establish and maintain an airway and ensure adequate oxygenation and ventilation, including intubation. In addition, clinicians should consider the possibility of multiple drug involvement.
  • In addition, gastric lavage (after intubation, if the patient is unconscious) and administration of activated charcoal with a laxative should be considered. The administration of activated charcoal (1 g) reduced the Cmax and AUC of oral olanzapine by about 60%. As peak olanzapine levels are not typically obtained until about 6 hours after dosing, charcoal may be a valuable treatment for olanzapine overdose.
  • The possibility of obtundation, seizures, or dystonic reaction of the head and neck following overdose may create a risk of aspiration with induced emesis. Therefore, cardiovascular monitoring should commence immediately and include continuous electrocardiographic monitoring to detect possible arrhythmias.
  • Hypotension and circulatory collapse should be treated with appropriate measures; intravenous fluids and sympathomimetic agents. Do not use epinephrine, dopamine, or other sympathomimetics with beta-agonist activity, since beta stimulation may worsen hypotension in the setting of the olanzapine-induced alpha blockade.
  • Close medical supervision and monitoring should continue until the patient recovers.[35]

Enhancing Healthcare Team Outcomes

Olanzapine is one of the most commonly used medications in episodes of psychosis.[36] As mentioned above, the half-life of olanzapine is the same among all three forms of administration. Thus, it should not influence the decision of which route of administration to choose. Consequently, ethics plays a significant role when discussing the chosen route of administration for olanzapine.

From a clinical standpoint, the injection form may be the preferred route when dealing with an agitated patient who does not wish or cannot swallow a pill; however, a provider should not subject a patient to injection if they do not need it. Strong interpersonal communication skills are necessary when working with an uncooperative or agitated patient. If the patient can consume the dissolving form of olanzapine, this route of administration should merit consideration over the injectable form.

The prescribing clinician should work closely with specialists, the pharmacy, and the nursing staff in patients receiving olanzapine. Nursing staff will administer the medication in the most controlled circumstances; they should be alert to patients refusing to take the drug and watch for its adverse effects. In this scenario, specialty-trained psychiatry nurses can contribute as they are more familiar with monitoring parameters. Pharmacists should carefully vet the patient's medication regimen, looking for red flags for drug interactions. A board-certified psychiatric pharmacist can participate in agent selection and dosing with the clinicians. Clinicians should be familiar with the fact that long-acting intramuscular olanzapine carries a substantial risk of delirium. Hence, it is only available through the FDA REMS(Risk Evaluation and Mitigation Strategy) program.[37][38]

In the case of an overdose, emergency department physicians should ensure a patent airway, breathing, and circulation. Similarly, critical care physicians and ICU nurses can play a vital role in cases of severe overdose. Finally, psychiatry referral is crucial in the case of intentional overdose. As illustrated above, clinicians (MDs, DOs, NPs, PAs), specialists, pharmacists, nurses, and other healthcare providers are involved in taking care of the patient. Therefore, all the healthcare providers working in an interprofessional team should collaborate closely so that the patient on olanzapine receives the maximum benefit with minimal adverse effects, resulting in optimal patient outcomes. 

APA guidelines recommend that patients with schizophrenia receive assertive community treatment (ACT) if there is poor compliance with treatment. For ACT to be successful, a multidisciplinary strategy is necessary in which patients receive individualized care from clinicians, psychiatrists, nurses, social workers, and case managers. Patients with poor compliance may benefit from considering a long-acting injectable (LAI) antipsychotic medication like olanzapine. Studies suggest that assertive community treatment with an interprofessional team-based approach is associated with improved quality of life, and patients are less likely to be hospitalized.[9][39] [Level 1]

Review Questions


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Disclosure: Kristina Thomas declares no relevant financial relationships with ineligible companies.

Disclosure: Abdolreza Saadabadi declares no relevant financial relationships with ineligible companies.

Copyright © 2023, StatPearls Publishing LLC.

This book is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits others to distribute the work, provided that the article is not altered or used commercially. You are not required to obtain permission to distribute this article, provided that you credit the author and journal.

Bookshelf ID: NBK532903PMID: 30422498


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