Depends what kind of worms you are eliminating.
Tapeworms(cestodes)......Praziquantel
Round worms(nematodes).....Levamisole, Flubendazole, Fenbendazole
Hexamita /Spironucleus (not a worm but a parasitic flagellate).....Metronidazole
Camallanus (nematodes) Levamisole
Capillaria (nematodes) levamisole or fenbendazole