About at my wit's end. I adopted my sweet Maine coon/bob tail mix, Lenny, from a local rescue group back in August 2017. She was approximately 4 months old at adoption. She is the sweetest girl and my older cat, Boogie, loves her. Approximately a week after adopting her, horrible diarrhea. Took her to the vet and got the giardia diagnosis. Did panacur and metro and it resolved. Ten days later, it came back which the vet warned me it might. No big deal, a longer course. Approximately a month later it did. More meds and this time highly digestive canned cat food. Regardless of what food she was on, it comes back about every month. I wash her, clean the litter box 1-2x daily. I give her a probiotic powder and the vet has her on hills digestive weight management rx dry food (because of the high fiber). Her last full blown giardia episode was approximately a month ago and the vet said not only she had giardia but roundworm (from where, I have no idea). Not only did a deworm her, but also Boogie, who has had no symptoms whatsoever. Both of them are indoor apartment cats. The medication of metro and panacur did the trick. Also been giving her a three day course of panacur every ten days for the past month to knock out any larvae/cysts. I thought maybe I was done but I woke up this morning to that awful smell. Luckily it was half formed, half soft, and it was all in the litterbox. I took a sample and will take it to the vet during my lunch break. I will also have her shaved this evening at the vet. I'm about to lose it. Is there any other medication that will knock it out? I'm thinking the giardia is now resistant to at least the panacur if not the metro as well.