BackgroundSevere challenging behaviors in autistic adults are difficult to manage in generic psychiatric settings and impose a heavy burden on individuals, families, and services. The Piedmont Region (Italy) established a specialized third-level inpatient unit for these presentations, embedded within an integrated, three-tier regional network. This study reports preliminary effectiveness data from this model.Materials and methodsIn a prospective, pre-post design, 10 autistic adult males admitted for severe challenging behaviors received an intensive, individualized psychoeducational program based on Applied Behavior Analysis during a time-limited specialized admission. Psychopathology (Brief Psychiatric Rating Scale, BPRS), challenging behaviors (Aberrant Behavior Checklist, ABC), global clinical severity (Clinical Global Impression, CGI), and social support (Social and Affective Functional Support Scale, SSAF) were assessed before admission (T0) and at discharge (T1). Change was examined with paired-samples t-tests and standardized effect sizes; given the sample size and number of comparisons, analyses were exploratory.ResultsImprovement was selective rather than uniform. On the BPRS, significant reductions emerged across several dimensions, concentrated in a coherent behavioral-disorganization and agitation cluster (i.e., motor tension, distractibility, bizarre behavior, conceptual disorganization, and anxiety) with large effect sizes. The ABC showed significant reductions in lethargy/social withdrawal and hyperactivity, whereas stereotypic behavior, irritability, and inappropriate speech did not change significantly. CGI and SSAF showed non-significant trends toward improvement. Trait-like, affective, and global dimensions appeared least responsive to the admission.ConclusionA time-limited, specialized inpatient program delivered within an integrated regional network was associated with improvement concentrated in observable, modifiable behavioral dimensions. These preliminary findings support the development of specialized, coordinated care pathways for severe challenging behaviors in autistic adults and warrant controlled studies with larger, sex-diverse samples and post-discharge follow-up.