Are you saying that mebendazole is not absorbed into the blood(ie. low availability)?

I'm ordering it right now from the UK, I was in doubt about which one from this family of drugs I should buy since they appeared to be very similar in spectrum and metabolism.

If what you're saying is true, then I chose correct because I'm trying to find drugs that are not absorbed into blood but stay in the gut, thereby limiting toxicity(my parasites are limited to the intestines).