Unless and until the new age ascension preachers are right about the earth quickly moving into a higher vibrational frequency where the lower vibrations that sustain the life of parasites no longer exist, and therefore parasites will no longer be able to exist, the only cure is preventive maintenance. IMHO and, as always, I reserve the right to be wrong.
I do, however, cling to the belief that there is such a thing as a full body spontaneous die off, where an entire colony gives up the ghost simultaneously, and leaves a person's body. The way to make that happen is to be sure your internal environment is NOT an environment parasites can thrive in.
Zappers will do that while you are zapping. There are dozens, if not hundreds of herbs that will make them wish they lived somewhere else. DE will cut them to pieces. Hot and cold packs, heavy exercise, enzymes, raw food and juices, Iodine, Trapper's SSKI , fasting on nothing but water, meditation, yoga, do everything you can.