Carcainium chloride is primarily utilized in medical and pharmacological research due to its properties as a choline kinase inhibitor. It is employed in studies focused on understanding cellular metabolism, particularly in cancer research, where it helps investigate the role of choline metabolism in tumor growth and progression. By inhibiting choline kinase, it disrupts the synthesis of phosphatidylcholine, a critical component of cell membranes, thereby affecting cancer cell proliferation. Additionally, it serves as a tool compound in biochemical assays to explore potential therapeutic targets for diseases linked to altered choline metabolism. Its application extends to preclinical studies aimed at developing novel anticancer strategies.