This document discusses drugs used to treat helminthiasis (intestinal worm infections). It begins by defining helminthiasis and describing the clinical symptoms. It then classifies the main types of intestinal worms as nematodes (roundworms) and platyhelminthes (flatworms such as tapeworms). Various anti-helminthic drug classes are discussed, including benzimidazoles (e.g. albendazole, mebendazole), pyrantel pamoate, diethyl carbamazine, ivermectin, levamisole, niclosamide, and praziquantel. Specific drugs like mebendazole, albendazole