Abstract
For patients with attention deficit hyperactivity disorder and comorbid conduct-dissocial disorder, a combination therapy of the psychostimulant methylphenidate and the antipsychotic risperidone may be prescribed. Case reports describe the occurrence of movement disorders under this combination therapy, but clinical trials had limited power to detect these events. This study aimed (1) to summarise published case reports and (2) to analyse pharmacovigilance data consisting of adverse drug event reports to elucidate these reactions. PubMed, Embase, and APA PsycInfo were used to retrieve case reports. For the pharmacovigilance data, aggregated information on individual case safety reports (ICSRs) within the database of suspected adverse drug events by the WHO were analysed. ICSRs were assessed for disproportionality in reporting. Thirteen published case reports (62% male) on movement disorders were identified, with ages between 5 and 15 years. Seven reports (54%) described incidents when risperidone was tapered down or switched to methylphenidate. From the WHO, we identified 25,556 ICSRs (16,118 for methylphenidate, 8,614 for risperidone, and 824 for both). Of these, 953 (5.9%), 1356 (15.7%), and 159 (19.3%) ICSRs reported movement disorders in association with methylphenidate, risperidone or both, respectively. The analyses on disproportionality showed an increased number of ICSRs with movement disorders when the two drugs were coded in combination. The potential of movement disorders as adverse effects might be amplified when methylphenidate and risperidone are used in combination. The results from the literature underline the necessity of caution and patient monitoring when risperidone dosing is modified during methylphenidate therapy.
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The study was enabled by funds from the ETH Zurich, no external sources of funding were used to assist in the conduct of this study or the preparation of this article.
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Authors DS, SW, and AMB designed the study. DS managed the literature searches and analyses. DS and AMB undertook the statistical analysis, and DS wrote the first draft of the manuscript. All authors contributed to and have approved the final manuscript.
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The authors declare that they have no conflicts of interest relevant to the content of this study. SW is a member of the Pharmacovigilance Risk Assessment Committee (PRAC) of the European Medicines Agency (EMA). The views expressed in this article are the personal views of the authors and may not be understood or quoted as being made on behalf of or reflecting the position of the European Medicines Agency or one of its committees or working parties.
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Stämpfli, D., Weiler, S. & Burden, A. Movement disorders and use of risperidone and methylphenidate: a review of case reports and an analysis of the WHO database in pharmacovigilance. Eur Child Adolesc Psychiatry 30, 1047–1058 (2021). https://doi.org/10.1007/s00787-020-01589-2
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DOI: https://doi.org/10.1007/s00787-020-01589-2