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Catatonia is increasingly recognized in individuals with autism spectrum disorder (ASD). Empirical data on treating catatonia in this population are limited. The purpose of this study is to provide naturalistic data on the use of clozapine for the treatment of catatonia in patients with ASD. Medical records of 12 individuals with ASD and catatonia who received treatment with clozapine were reviewed. Treatment response to clozapine was rated by assigning a retrospective Clinical Global Impression Improvement scale (CGI-I) score. Mean (SD) and median (IQR) age at initiation of clozapine treatment were 22.1 (7.7) and 20.4 (9.7) years, with a range of 10–39 years. Eleven of the 12 patients had received treatment with lorazepam prior to initiating clozapine and 9 of the 12 patients received concomitant treatment with lorazepam and clozapine. Eleven of the 12 patients (92%; 95% CI: 65%, 99%) responded to clozapine. All 12 patients remained on clozapine at the time of their most recent clinical note. All 12 patients (100%; 95% CI: 76%, 100%) experienced one or more adverse events, the most common of which was sedation ( n  = 11, 92%). Overall, clozapine was associated with a high response rate for the treatment of catatonia in patients with ASD. These naturalistic data support the use of clozapine for the treatment of catatonia in patients with ASD for whom lorazepam is either ineffective or partially effective.

Clozapine for treatment refractory catatonia in individuals with autism spectrum disorder: a retrospective chart review study