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A derivative of benzimidazole, albendazole is a drug with a broad antihelmintic spectrum. It exhibits an antihelmintic effect against sensitive cestodes and nematodes by blocking the process of glucose uptake by the parasites, which is expressed in the depletion of glycogen reserves and subsequent reduction in the level of adenosintriphophate. As a result, the parasite stops moving and dies. It is used upon infection of Acaris lumbricoides, Ancylostoma duodenale, Necator americanus, Enterobius vermicularis, and Trichuris trichiura. Synonyms of this drug are SKF 62979 and others.

Thiabendazole: Thiabendazole, 2-(4'-thiazolyl)benzimidazole (38.1.9), is also made in the same manner—heterocyclization which occurs upon reacting o-phenylendiamine with 1,3-thiazol-4-carboxylic acid [4-6].

Thiabendazole is an antihelmintic drug with a broad spectrum of action. Although the details of its mechanism of action are not conclusively known, it seems likely that its action is mediated by the inhibition of a specific enzyme of helminthes—fumarate reduc-tase. Thiabendazole is active with respect to most nematode infections, including

Angyostrongylus cantonesis, Strongyloides stercoralis, Trichinella spiralis, Toxocara canis, Toxocara cati, Ancylostoma caninum, A. brazilienseß, A. duodenale, Dracunculus medinesis, Capillaria philippinesis, as well as for treating Acaris cantonesis and Shistosoma stercoralis. Synonyms of this drug are mintezol, minzolum, and others.

Niridazole: Niridazole, 1-(5-nitro-2-thiazolyl)-2-imidazolidinone (38.1.11), is made by reacting 2-amino-5-nitrothiazol with 2-chloroethylisocyanate to make the disubstituted urea (38.1.10). Heating this compound results in an intramolecular N-alkylation reaction to form the desired imidazolidine derivative, niridazole [7-11].

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