Used primarily as an anthelmintic to treat parasitic worm infections, especially pinworm (Enterobius vermicularis) and roundworm (Ascaris lumbricoides) infestations in humans and animals. It works by paralyzing the worms through depolarizing neuromuscular action, causing them to lose their grip on the intestinal wall, after which they are expelled naturally through bowel movements. Commonly found in over-the-counter and prescription deworming medications, it is often used in single-dose treatments due to its high efficacy and safety profile. Also used in veterinary medicine for treating gastrointestinal parasites in pets such as cats and dogs.