Levothyroxine (T4) is a synthetic levo-isomer of thyroxine, functioning as a precursor to triiodothyronine (T3), the active form involved in metabolic and biochemical processes. T4 undergoes deiodination to regulate enzymatic pathways associated with energy utilization, protein interactions, and molecular signaling. This compound exhibits high plasma protein binding (~99%), interacting primarily with thyroxine-binding globulin (TBG), transthyretin, and albumin-like structures. It is metabolized through deiodination, conjugation, and oxidative deamination, with pathways involving enzymatic transformations and excretion mechanisms.
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