I'm still shedding parasites after being on an H2O2 (Hydrogen-Peroxid) therapy for quite a while. My understanding of colliodal silver is that it hyper oxagenates the blood. Meaning it adds O2. Adding O2 will help you detox, and it will kill off any bacteria or virus that are contained inside the parasite or their eggs. But I don't think it's going to do much to the larger parasites, in fact it might help them survive. I know that I didn't kill of my large tape worm until after I'd tapered off the H202, and started on the herbs.
I would try a mild Colon Cleanse with a lot of fiber after a paracite cleanse, and try altering you diet- this is what I'm doing when I'm not using the anti- parasite stuff. You might consider taking the Colloidal Silver during the parasite cleanse, you will get rid of the bacteria that are released from their bodies after they die.
Please understand that this is just my personal take on the situation, I'm not a doctor or an herbologit, and I'm still trying to put this stuff together myself.