Para-zap is used to treat internal parasites, not external (mites, ticks, etc) like BK...
It can be very difficult to have medications/pesticides/chemicals/herbals shipped across borders, due to touchy legal issues, and differences in approval from country to country. Many companies don't want to risk getting nabbed. I don't know the specifics on Para-zap, but I'm guessing it would fit into that generalization. Hopefully someone else will have some better info for you