Used primarily to treat thiamine (vitamin B1) deficiency, especially in cases where oral intake is insufficient or absorption is impaired. Commonly applied in the management of conditions like beriberi and Wernicke-Korsakoff syndrome. Also utilized in some countries to support recovery in patients with chronic fatigue, neuritis, and certain neurological disorders linked to B1 deficiency. Its lipid-soluble nature allows better tissue penetration and longer retention compared to water-soluble thiamine, making it effective in sustained therapeutic applications. Often prescribed in cases of alcoholism-related neuropathy due to improved bioavailability and nervous system support.