Levothyroxine sodium is a synthetic crystalline levothyroxine sodium (L-thyroxine). L-thyroxine is the principal hormone secreted by the normal thyroidgland. Chemically, L-thyroxine is designated as L-tyrosine, O- (4-hydroxy-3, 5-diiodophenyl) - 3,5-diiodo -, monosodium salt, hydrate. It is used in replacement or supplemental therapy in patients of any age or state (including pregnancy) with hypothyroidism of any aetiology except transient hypothyroidism during the recovery phase of sub- acute thyroiditis: primary hypothyroidism resulting from thyroid dysfunction, primary atrophy, or partial or total absence of the thyroidgland, or from the effects of surgery, radiation or drugs, with or without the presence of goitre, including sub-clinical hypothyroidism; secondary (pituitary) hypothyroidism; and tertiary (hypothalamic) hypothyroidism. Research Levothyroxine Sodium
Aetiology is a now obsolete term describing the science of the causes of phenomena. The term is still used in medicine to describe the science investigating the causation of disease. Research Aetiology
 
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