Triethylenetetramine dihydrochloride is primarily used as a chelating agent for heavy metals, particularly in the treatment of Wilson's disease, where it promotes the urinary excretion of excess copper as an antidote. It serves as an intermediate in the synthesis of pharmaceuticals, dyes, and resins, functioning as a cross-linking agent in polymer chemistry. In industrial applications, it prevents metal-catalyzed oxidation and scale in water treatment systems. It is also employed in agriculture as a component in fungicides and plant growth regulators, and in laboratory settings as a reagent or catalyst in organic synthesis.