There are a lot of worm products available on the market, however most wormers can be broadly placed into groups:
– The ‘BZ’s’: the benzimadazole group includes oxfendazole, oxbendazole, fenbendazole. There are multiple strains of resistant worms in Australia to the ‘BZ’s’, especially small cyathastomes.
– The ‘BZ’s’s are often combined with Morantel or Pyrantel to reduce the level of resistant worms to treatment, and to treat tapeworm infection.
– The ‘Mectins’ (macrocyclic lactones): the ‘mectins’ were released approximately 20 years ago and had a significant effect on controlling worms in horses and other species. Unfortunately there is evdience of resistant strains in some worms in Australia. The ‘mectins include: ivermectin, abamectin and moxidectin.
– Praziquantel: effective against tapeworm