Niclosamide, sold under the brand name Niclocide among others, is an anthelmintic medication used to treat tapeworm infestations, including diphyllobothriasis, hymenolepiasis, and taeniasis.

[3] Rarely, dizziness, skin rash, drowsiness, perianal itching, or an unpleasant taste occur.

[citation needed] Important Note: Niclosamide kills the pork tapeworm and results in its digestion.

For example, it is an active ingredient in some formulations such as Bayluscide for killing lamprey larvae,[11][12] as a molluscide,[13] and as a general purpose piscicide in aquaculture.

[13] Researchers have found that niclosamide is effective in killing invasive zebra mussels in cool waters.