Isothiazol-5-amine hydrochloride is primarily used in the field of organic synthesis, where it serves as a key intermediate in the production of various pharmaceuticals. Its structure is particularly valuable in the development of compounds with potential antimicrobial and antifungal properties. Researchers utilize this chemical to create novel molecules that can be tested for therapeutic efficacy against a range of pathogens. Additionally, it is employed in the synthesis of agrochemicals, contributing to the development of new pesticides and herbicides that help protect crops from pests and diseases. The compound's versatility in chemical reactions makes it a valuable tool in both medicinal and agricultural chemistry.