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The patients\u2019 acute medication, their time course of recovery, and their side effects were assessed by up to 8 repeated measurements. The genotyping included 100 candidate genes with genotypic patterns computed from 549 Single Nucleotide Polymorphisms (SNPs). Between 61.9% and 68.1% of study patients reported moderate to severe side effects, while response rates were with 29.5\u201335.7% quite modest. Half of the patients (52.1%) experienced weight gains of \u2265\u20092\u00a0kg. On the phenotype level, up to 30% of the observed variance could be \u201cexplained\u201d by regression models with the dominating factor \u201cnumber of concurrent drugs\u201d. On the genotype level, we relied on standard Artificial Intelligence (AI) procedures along with multilayer Neural Nets (NNs) to search for combinations of multidimensional genotypic patterns that were characteristic of patients with severe side effects, while being rare (&lt;\u200910%) among patients without side effects. These analyses failed to explain a clinically relevant proportion of the observed phenotypic variance. The 14 cytochromes analyzed were found to play no more than a minor role. While type and severity of side effects under polypharmacy were primarily determined by the overall medication \u201cload\u201d, the actually observed side effect patterns varied considerably between patients receiving the same medication \u201cload\u201d, thus stressing the role of genetics. Our results suggested that the role of genetics in the development of severe side effects under polypharmacy is by far more complex than previously assumed, related to a completely different set of genes, or that there exists genotypic heterogeneity such that multiple pathways on the genotype level lead to the same clinical picture on the phenotype level.<\/jats:p>","DOI":"10.1007\/s00406-025-02062-4","type":"journal-article","created":{"date-parts":[[2025,7,28]],"date-time":"2025-07-28T04:00:18Z","timestamp":1753675218000},"page":"691-707","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Genetic predisposition to unwanted side effects under antidepressants and antipsychotics: a molecular-genetic study of 902 patients over 6 weeks"],"prefix":"10.1007","volume":"276","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6872-0619","authenticated-orcid":false,"given":"Hans H.","family":"Stassen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Bachmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Bridler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"Cattapan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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