Aww, I'm sorry, I feel your pain
It took 3 rounds of meds to clear it up in my two! I thought we'd never get rid of it and I was so sick of them being sick and me having to constantly clean everything in Clorox.
A couple weeks ago they had soft stools on the verge of being watery and I panicked and took their poop in to be checked. Thank God it was clear. I think the vet asst. thought I was nuts but once you've been through a nasty bout of that you don't want to go through it again!
Good luck, hopefully this round of meds will work for you
