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Introduction: Existing scales that seek to measure alterations in self-experience were based on studies conducted in developed countries. Therefore, the aim of this study was to evaluate the psychometric properties of the Ego-Dissolution Inventory (EDI), translate and adapt it to the Brazilian context.Methods: Translation of the measure was made by two translators fluent in both English and Portuguese, with back-translation into English to ensure there was no loss of meaning.The scale was included in an online survey exploring substance use. A total of 528 participants answered the full scale. We calculated the Kaiser-Meyer-Olkin (KMO) measure to evaluate sampling adequacy, then ran Exploratory Analysis Factor (EFAs) to investigate the factor structure of the EDI. Results:The scale showed acceptable psychometric properties, with excellent internal consistency and sampling adequacy for a factor analysis. Kaiser-Gutman's criteria and Hull's method pointed to a three-factor solution, while Parallel Analysis suggested a twofactor solution. All items showed salient loadings, with two items exhibiting crossloading. Positive but weak correlations were found between EDI factors 1 and 2 and nature-relatedness. Conclusions:The validated scale showed solid psychometric properties, with potential differences in factor structure in relation to the English version. Considering validation as ongoing process, it is recommended to conduct studies comparing the scores of ego dissolution across distinct substances and different regions of the country.

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