Thanks for the great post, Selina. I had no idea ivermectin was technically good only up to 18 days. I've used it for decades. But then almost ten years ago, I switched to Revolution because of its safety record with ferrets and effectiveness. But mostly just because it covers so dang much. I mean talk about a big bang for your buck. So yes, we use Revolution kitten. I've often thought about going back to my old ivermectin solution though. Wolfy [Posted in FML 7387]