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.

Side effects include nausea, vomiting, abdominal pain, constipation, and itchiness. It may be used during pregnancy and appears to be safe for the baby. Niclosamide is in the anthelmintic family of medications. It works by blocking the uptake of sugar.

Side effects include nausea, vomiting, abdominal pain, constipation, and itchiness.Rarely, dizziness, skin rash, drowsiness, perianal itching, or an unpleasant taste occur. For some of these reasons, praziquantel is a preferable and equally effective treatment for tapeworm infestation.

Niclosamide inhibits glucose uptake, oxidative phosphorylation, and anaerobic metabolism in the tapeworm.