Niclosamide

Niclosamide, sold under the brand name Niclocide among others, is an anthelmintic medication used to treat tapeworm infestations, including diphyllobothriasis, hymenolepiasis, and taeniasis. It is not effective against other worms such as flukes or roundworms. It is taken by mouth.

Niclosamide
Clinical data
Trade namesNiclocide, Fenasal, Phenasal, others
AHFS/Drugs.comMicromedex Detailed Consumer Information
Routes of
administration
By mouth
ATC code
Identifiers
  • 5-Chloro-N-(2-chloro-4-nitrophenyl)-2-hydroxybenzamide
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.000.052
Chemical and physical data
FormulaC13H8Cl2N2O4
Molar mass327.12 g·mol−1
3D model (JSmol)
Melting point225 to 230 °C (437 to 446 °F)
  • Clc2cc(ccc2NC(=O)c1cc(Cl)ccc1O)[N+]([O-])=O
  • InChI=1S/C13H8Cl2N2O4/c14-7-1-4-12(18)9(5-7)13(19)16-11-3-2-8(17(20)21)6-10(11)15/h1-6,18H,(H,16,19) Y
  • Key:RJMUSRYZPJIFPJ-UHFFFAOYSA-N Y
 NY (what is this?)  (verify)

Side effects include nausea, vomiting, abdominal pain, and itchiness. It may be used during pregnancy. It works by blocking glucose uptake and oxidative phosphorylation by the worm.

Niclosamide was first synthesized in 1958. It is on the World Health Organization's List of Essential Medicines. Niclosamide is not available for human use in the United States.

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