Used primarily as an anthelmintic in veterinary medicine to treat parasitic worm infections in livestock and companion animals. It works by acting as an agonist at nicotinic acetylcholine receptors in nematodes, causing spastic paralysis and leading to expulsion of the parasites from the host. Also investigated for immunomodulatory effects in certain autoimmune conditions and as an adjuvant in vaccine strategies due to its ability to enhance cellular immune responses. Has been used in research settings to study immune system regulation and apoptosis. Previously used in humans as an immunomodulator but discontinued due to severe side effects like agranulocytosis.