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Olanzapine, sold under the trade name Zyprexa among others, is an atypical antipsychotic primarily used to treat schizophrenia and bipolar disorder. For schizophrenia, it can be used for both new onset disease and long term maintenance. It is taken by mouth or by injection into a muscle.Common side effects include weight gain, movement disorders, dizziness, feeling tired, constipation, and dry mouth. Other side effects include low blood pressure with standing, allergic reactions, neuroleptic malignant syndrome, high blood sugar, seizures, gynecomastia, erectile dysfunction, and tardive dyskinesia. In older people with dementia, its use increases the risk of death. Use in the later part of pregnancy may result in a movement disorder in the baby for some time after birth. Although how it works is not entirely clear, it blocks dopamine and serotonin receptors.Olanzapine was patented in 1971 and approved for medical use in the United States in 1996. It is available as a generic medication. In the United States, the wholesale cost is less than US$0.25 per dose as of 2018. In 2016, it was prescribed more than 2 million times in the United States.
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