Here is a link to a webpage listing many antiparasitic herbs if you want to avoid taking mebendazole. Elecampagne, turmeric, ginger and garlic seem like good non toxic things to add to a parasite cleanse to get rid of roundworms. Make sure your parasite cleanse has enough cloves in it. You might want to take some extra cloves but don't overdo it, as in large quantities cloves can be toxic.