Isoquinoline is widely used in the pharmaceutical industry as a key intermediate for synthesizing various drugs, including antihypertensive, antimalarial, and anticancer agents. Its derivatives are also employed in the production of dyes, agrochemicals, and corrosion inhibitors. Additionally, isoquinoline serves as a building block in organic synthesis for creating complex molecules with diverse biological activities. In research, it is utilized as a ligand in coordination chemistry and as a fluorescent probe in biochemical studies. Its versatility makes it valuable in both industrial and academic settings.