Antiparasitic/Anthelmintic/Vermifuges are generally toxic to humans when taken in high doses. Most of them should be used under the guidance of a qualified healthcare professional. Often they are used in conjunction with laxatives to help expel the worms. In case the worm is only stunned and not fully killed, it is important to expel it out of the body before it latches on again. Most antiparasitics directly kill worms in the intestinal tract, while other antiparasitics, such as Artemisia annua, work outside the intestinal tract as well.