Niclosamide, is a medication used to treat tapeworm infestations. This includes diphyllobothriasis, hymenolepiasis, and taeniasis. It is not effective against other worms such as pinworms or roundworms. It is taken by mouth.

Niclosamide is used to treat broad or fish tapeworm, dwarf tapeworm, and beef tapeworm infections. Niclosamide may also be used for other tapeworm infections as determined by your doctor.

Niclosamide works by killing tapeworms on contact. The killed worms are then passed in the stool. However, you may not notice them since they are sometimes destroyed in the intestine.

Niclosamide is an oral antihelminthic drug used to treat parasitic infections in millions of people worldwide. However recent studies have indicated that niclosamide may have broad clinical applications for the treatment of diseases other than those caused by parasites. These diseases and symptoms may include cancer, bacterial and viral infection, metabolic diseases such as Type II diabetes, NASH and NAFLD, artery constriction, endometriosis, neuropathic pain, rheumatoid arthritis, sclerodermatous graft-versus-host disease, and systemic sclerosis.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5628105/#:~:text=Niclosamide%20is%20an%20oral%20antihelminthic,than%20those%20caused%20by%20parasites.