Thanks Shroom
I think you're probably right. I'm going to try Tinidazole, which is similar to Metronidazole, but apparently only needs 2g 1 day dose for Giardia. I am sceptical about this working though having had Antibiotics for over a year for the d.fragilis infection. I had to take Jackie Delaney's (badbugs.org) 3-drug combo twice, after all others failed. I did try alsorts of herbal parasite killers, which we all useless and expensive. These critters are really hard to kill off, but my test did show that i have successfully repopulated by gut with bacteria for the first time in 6 years! I have read your threads about your 'head' drug - its sounds interesting and I hope it works for you.
Candiva