A good parasite cleanser that I know works well is Para-Cleanse by Natures Sunshine Products. The chinese herbs kill everything from micro-scopic parasites to tape worms.
It can be ordered at http://www.BetterHerbs.com for a discounted price of about $17.00 regular pricing retail is about $25.00 a box. It takes 3 boxes with a wait of 10 days between each 10 day period of taking it. Shipping is free if the order is over $40.00
My sister had a really bad infection of all kinds of worms and 3 or 4 tapeworms... she is a really clean person. She was juice-fasting so she could really see what came out, and it killed many. She does a maintance clease every few months.
Last time I did a Humaworm cleanse (I do cleanses too, just to make sure I get rid of anything I may have picked up) and although I really liked the fresh herbs, I am going back to Para-Cleanse (Chinese herbs) because I have learned that some parasites lay a ton of eggs, that don't hatch unless the 'parent' is dead. So there needs to be short breaks in the killing to make sure you get the young ones.
I don't sell this stuff... you can probably find it at other websites, but in my experience Better Herbs has the best deal.