Ammonium iodide is primarily used in the pharmaceutical industry as a source of iodine in various medicinal formulations. It is employed in the preparation of expectorants to help clear respiratory congestion by thinning mucus. Additionally, it serves as a reagent in organic synthesis, particularly in the formation of iodinated compounds. In photography, it is utilized in the production of light-sensitive emulsions. The compound also finds application in analytical chemistry as a component in iodide-based titrations. Furthermore, it is used in the manufacturing of certain dyes and as a stabilizer in some chemical processes.