The main treatment for parasites is prevention. There are medications which can be toxic. I utilize herbal remedies which are very effective especially wormwood and mugwort. I usually use 1 gram two to three times a day.
Grapeseed extract has also been used . Other remedies have been written about such as balmony, butternut bark, Pennyroyal and Southerwood. These were described in SY Mills book on Parasite Remedies.
I tend to use berberine containing plants as Barberry and Oregon grape
I have seen fresh fig sap rid the body of Whipworm and even threadworm disappear when an enema bag of quassia is used.