Ammonium iodide is widely used in the pharmaceutical industry as a source of iodide ions in various medicinal formulations. It plays a crucial role in the treatment of iodine deficiency disorders, such as goiter, by supplementing iodine in the body. In organic synthesis, it serves as a reagent for the preparation of iodinated compounds, facilitating reactions like iodination and nucleophilic substitution. Additionally, it is employed in the manufacturing of photographic chemicals, where it acts as a sensitizer in silver halide emulsions to enhance image quality. In analytical chemistry, ammonium iodide is utilized as a component in iodide-based redox titrations for determining the concentration of oxidizing agents. It also finds application in the production of specialty chemicals, including dyes and pigments, where it acts as a catalyst or intermediate.