Eg: Emodepside . Effective against a variety of gastrointestinal helminths Many members of the piperazine family are successful anthelmintics. Natural anthelmintics include black walnut , wormwood ( Artemisia absynthium ), clove ( Syzygium aromaticum ), tansy tea ( Tanacetum vulgare ), Hagenia (Hagenia abyssinica) , kalonji ( Nigella sativa ) seeds,