Updated On September 23rd, 2025
Pet's info: Cat | Mixed Breed | Male | neutered | 16 lbs
My cat has been sneezing for a week and half. He has a little bit of brown eye crust. He is eating fine. He acts normal. I have been given him 250 mg l-lysine for about a week. I read that this might be something that will come back from time to time. I don’t want to have to give him antibiotics unless it’s necessary. How long should I wait to take him to vet? how long should I continue with l-lysine? I use vaporizer to help him. He is indoor, not around other cats. This may be stress induced.
1 Answer
Published on December 19th, 2017
If you know that he has a virus and has had an upper respiratory infection (URI) before then yes this may come back occasionally, but if it is going to clear up on its own it will usually do so within a week. If you know that he has feline leukemia or feline aids then I would strongly recommend to get him seen by your vet sooner rather than later. These guys do not have good immune systems and an URI can quickly turn into pneumonia. Most cats with immunocompromised viruses usually need help with antibiotics to help them get over such infections. I would continue to give l-lysine until he is well. If you do not think kitty is immunocompromised, then I would still be concerned that it has been going on for 10 days. You can try adding in Benadryl - see link below- in case there is an allergy component to see if this helps. If it isn’t improving, worsens, or at any point he isn’t eating or lethargic, I would have your vet take a look at him. Your vet will be able to get him started on some antibiotics and even take X-rays if needed to ensure he doesn’t have pneumonia. I hope this helps! https://www.petcoach.co/canigive/cat/benadryl/
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