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Purpose: The purpose of this article is to examine the efficacy of oxytocin in treating core symptoms of autism spectrum disorder (ASD) with children., Methods: A systematic literature search was conducted to identify randomized controlled trials (RCTs) of oxytocin for the treatment of core symptoms in children with ASD. The search included studies published between January 1, 1999 and March 15, 2023, that were randomized, single or double-blinded, and included a placebo control group. Standard screening rules were applied to select relevant studies, resulting in the inclusion of five RCTs involving 486 children with ASD., Results: Ultimately, a total of five RCTs, involving 486 children with ASD, were included in the review using standard screening rules.One of the included studies demonstrated a statistically significant improvement in Social Responsiveness Scale (SRS) and Repetitive Behavior Scale-Revised (RBS) scores when children with ASD were treated with oxytocin (24 IU/2 days for 6 weeks). The improvement in core symptoms persisted at the 6-month follow-up. The meta-analysis findings suggested that oxytocin might have a moderate effect in improving the core symptom of narrow interests and repetitive stereotyped behaviors in children with ASD., Conclusion: While the therapeutic value of oxytocin in treating core symptoms of ASD in children is not fully established, the results of this meta-analysis indicate a potential moderate effect. However, further studies with larger sample sizes and more robust RCTs are needed to directly demonstrate the efficacy of oxytocin. Future research should also focus on effect size and outcome evaluation accuracy while minimizing bias in RCT experiments., (© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)