Try caprylic acid with monolauric acid first. there was a poster who said she used these on her child and they eradicated the bugs. Iodoquinol is used for d. fragilis only while the 4 drug cocktail is used for b. hominis. These are short course treatments.
You can also look at a chinese herb called Coptis Chinensis that has shown some killing of b. hominis. You can see this post as well >>> //www.curezone.org/forums/fm.asp?i=1156080.
You want to stay away from Brucea Javanica as it does have some toxic properties.