Provided herein are methods for treating, reducing and/or ameliorating symptoms of autism spectrum disorder (ASD) in a subject, where at least one measure of social impairment, anxiety, or repetitive behaviors is treated and/or ameliorated. Aspects include intranasally administering arginine vasopressin (AVP), or an analog of vasopressin, to a subject (e.g., a child between 6 and 12 years of age and having endogenous pre-treatment levels between about 0.045 and about 4.028 pg/mL, where the mean was 1.324 pg/mL). In children having high pre-treatment blood levels of AVP (e.g., about 25% or more above the mean pre-treatment AVP blood levels of the treatment group; or having pre-treatment blood vasopressin levels greater than 1.324 pg/mL), the treatment was enhanced. Because no difference in pre-treatment blood AVP levels was observed between control and ASD subjects, it was surprising that AVP treatment was more effective in subjects having high pre-treatment AVP levels.
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