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The efficacy was assessed using total PANSS, and adverse effects using total UKU, during one\u2010year follow\u2010up. We used the Klm3D method to cluster longitudinal data.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We identified four clusters: cluster A, drug not toxic and beneficial; cluster B, drug beneficial but toxic; cluster C, drug neither toxic nor beneficial; and cluster D, drug toxic and not beneficial. These groups significantly differ in baseline demographics, clinical, and neuropsychological characteristics (PAS, total PANSS, DUP, insight, pIQ, age of onset, cocaine use and family history of mental illness).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The results presented here allow the identification of phenotypes of AP response that differ in well\u2010known simple and classic clinical variables opening the door to clinical prediction and application of personalized medicine.<\/jats:p><\/jats:sec>","DOI":"10.1111\/acps.13131","type":"journal-article","created":{"date-parts":[[2019,11,20]],"date-time":"2019-11-20T11:07:37Z","timestamp":1574248057000},"page":"541-552","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Personalized medicine begins with the phenotype: identifying antipsychotic response phenotypes in a first\u2010episode psychosis 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