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phenomenon emerging in dysfunctional families, particularly those with addiction. Prior studies show inconsistent definitions—disease, personality disorder, or psychopathology—and rely on instruments mostly applied to university samples, creating a gap in understanding its characteristics and treatment.This exploratory mixed-methods study analyzed core features of codependency through Carl Jung's analytical psychology using the Sandplay therapeutic technique. Seven women aged 30–50 who lived with substance-using partners, scored ≥30 on the ICOD, and completed 11 individual therapeutic sessions were included. Symbolic elements in their projective creations were interpreted within Jungian symbolism (including von Franz) and Chevalier & Gheerbrandt's Dictionary of Symbols, which identified links with the personal unconscious (complexes) and the collective unconscious (archetypes).Results indicated 71% treatment effectiveness (5/7 participants), with clinically meaningful reductions in codependency levels. Symbolic analysis revealed imbalances between feminine and masculine principles; expressions of the maternal complex appeared to require extended sessions for deeper transformation. Archetypal transitions were observed across all participants, particularly Shadow work and Self contact represented through geometric figures.Sandplay therapy emerged as a promising option for codependency, offering an integrative lens that transcended academic disputes over definitions. Future longitudinal work was recommended to evaluate the durability of change and develop standardized follow-up protocols. Ethics: This study was conducted following ethical research guidelines in Mexico, with written informed consent obtained from all participants.