Is olanzapine a high risk medication?

Olanzapine is a medication that is commonly used to treat schizophrenia and bipolar disorder. It belongs to a class of drugs called atypical antipsychotics. While it can be effective in treating these conditions, there are some potential risks associated with its use. In this article, we will explore whether olanzapine is a high-risk medication, drawing on studies and an analytical perspective.

The Potential Risks of Olanzapine

One of the main risks associated with olanzapine is weight gain. Studies have shown that people who take olanzapine are more likely to gain weight than those who take other antipsychotic medications or no medication at all (1). This weight gain can lead to other health problems, such as diabetes and heart disease.

Another potential risk of olanzapine is the development of metabolic syndrome. Metabolic syndrome is a cluster of conditions that increase the risk of heart disease, stroke, and diabetes. People who take olanzapine are at an increased risk of developing metabolic syndrome, even after controlling for other factors (2).

In addition to these physical health risks, olanzapine can also have negative effects on mental health. For example, some studies have found that olanzapine can cause cognitive impairment, which can affect a person’s ability to think, reason, and remember (3). Other potential side effects of olanzapine include sedation, dizziness, and dry mouth.

Analyzing the Risks

While there are certainly risks associated with olanzapine, it is important to put these risks in context. For example, while olanzapine is associated with weight gain, it is not clear whether this weight gain is greater than with other antipsychotic medications (4).

Similarly, while olanzapine is associated with an increased risk of metabolic syndrome, the absolute risk of developing this condition is still relatively low. In one study, for example, the incidence of metabolic syndrome in people taking olanzapine was 19%, compared to 10% in people taking other antipsychotic medications (5).

It is also important to note that the benefits of olanzapine may outweigh the risks for some people. For example, olanzapine has been shown to be effective in treating schizophrenia and bipolar disorder, which are serious and often debilitating conditions. For some people, the benefits of taking olanzapine may outweigh the potential risks.


In conclusion, olanzapine is a medication that is associated with some potential risks, such as weight gain and an increased risk of metabolic syndrome. However, it is important to put these risks in context and to consider the individual needs of each patient. For some people, the benefits of taking olanzapine may outweigh the risks, while for others, alternative treatments may be more appropriate. As always, it is important to discuss any concerns or questions with a healthcare provider.


  1. Lieberman, J. A., Stroup, T. S., McEvoy, J. P., Swartz, M. S., Rosenheck, R. A., Perkins, D. O., … & Hsiao, J. K. (2005). Effectiveness of antipsychotic drugs in patients with chronic schizophrenia. New England Journal of Medicine, 353(12), 1209-1223.
  2. Newcomer, J. W. (2007). Metabolic considerations in the use of antipsychotic medications: a review of recent evidence. The Journal of Clinical Psychiatry, 68(suppl 1), 20-27.
  3. Keefe, R. S., Sweeney, J. A., Gu, H., Hamer, R. M., Perkins, D. O., McEvoy, J. P., … & Lieberman, J. A. (2007). Effects of olanzapine, quetiapine, and risperidone on neurocognitive function in early psychosis: a randomized, double-blind 52-week comparison. American Journal of Psychiatry, 164(7), 1061-1071.
  4. Allison, D. B., Mentore, J. L., Heo, M., Chandler, L. P., Cappelleri, J. C., Infante, M. C., & Weiden, P. J. (1999). Antipsychotic-induced weight gain: a comprehensive research synthesis. American Journal of Psychiatry, 156(11), 1686-1696.
  5. Meyer, J. M., Davis, V. G., Goff, D. C., McEvoy, J. P., Nasrallah, H. A., Davis, S. M., … & Stroup, T. S. (2008). Change in metabolic syndrome parameters with antipsychotic treatment in the CATIE Schizophrenia Trial: prospective data from phase 1. Schizophrenia Research, 101(1-3), 273-286.

There are various forms of drugs available, such as tablets or liquids, and each may have a separate patient information leaflet (PIL) for different doses. It is important to refer to the PIL for the specific form and dose of the drug that you have been prescribed.

You can search for further information and PILs on websites such as:

  • The British National Formulary (BNF)
  • Electronic medicines compendium (emc)
  • The National Library of Medicine's DailyMed
  • The Food and Drug Administration (FDA) 
  • Different drug forms like tablets or liquids have specific patient information leaflets (PIL) for various doses. Refer to the PIL for your prescribed drug form and dose.

    Search for PILs on websites like:


    • ANSM (Agence nationale de sécurité du médicament et des produits de santé):


    • AEMPS (Agencia Española de Medicamentos y Productos Sanitarios):


    • BfArM (Bundesinstitut für Arzneimittel und Medizinprodukte):


    For questions about your medication:

    • Consult your doctor, a healthcare professional, or a pharmacist


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    • For mental health support, contact SOS Suicide: 01 45 39 40 00

    Belgium (French)

    Switzerland (French)

    • La Main Tendue: 143
    • Website:

    Canada (French)

    • Centre de prévention du suicide du Québec: 1 866 APPELLE (1 866 277-3553)
    • Website:


    • Contact emergency number: 112
    • For mental health support, contact Teléfono de la Esperanza: 717 003 717


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    • For mental health support, contact 113 Zelfmoordpreventie: 0800 0113


    • Contact emergency number: 112
    • For mental health support, contact Sos Voz Amiga: 21 354 45 45, 91 280 26 69, or 96 352 46 60

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