I didn’t see my issue come up, though I found other forums talking about bad reactions to Revolution. I’ve used it on my barn cats for at least 4 years. One cat had hair loss at the application site once, and both recoil from it, but I always thought it was due to liquid being applied.
I applied it to both cats on March 9th, and my adult male was not quite himself on March 11. I left him locked in the tack room March 12, and no improvement. Lethargic and not eating. Took him to the vet, no weight loss but 105.5 temp. Rads showed something going on with his small bowel - foreign object, lymphoma, or inflammation. Surgery and all tests for removing an object were over $4000, so I went with treating inflammation. It worked! I thought he wouldn’t make it, but turned the corner this weekend.
However, I’m now convinced the Revolution did it. Any similar experiences? And what do you use for flea control? I have food grade DE from treating bird mites in the barn swallow nests, but what other options work?