Used as a reagent in organic synthesis, particularly in the preparation of iodinated compounds. It serves as a source of hydriodic acid in situ when heated, facilitating reductions and cleavage reactions, such as the dealkylation of methyl esters or ethers. Commonly applied in the conversion of alcohols to alkyl iodides. Also utilized in the pharmaceutical industry for synthesizing active ingredients where controlled iodine release is required. Its role as a catalyst or additive in certain heterocyclic transformations enhances reaction efficiency under mild conditions.