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Updated on September 23rd, 2025
Pet's info: Cat | Mixed Breed | Male | neutered
My healthy 11 yo ginger cat's left eye was weeping (clear) and semi-closed. My vet administered a 0.5 ml Convenia injection and Maxitrol drops. Upon returning home, he seemed mildly lethargic. I Googled Convenia, and found horror stories of pet deaths. Later, I let him out into the garden, and he perked up - alert and playful. He also seems to be eating and drinking well. If he was allergic to Convenia, how long would it take to present? It's been 16 hours since the shot and I'm terrified.
1 Answer

Answered By Daniel Fonza, DVM
Veterinarian
Published on November 29th, 2017