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My cat has cold symptoms. What can I do for sneezing and lethargy?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 12 years and 5 months old

My indoor male cat (approx 10 years old), appears to have a cold. Sneezing, watery eyes and lethargic. He's eating and drinking water but is definitely not his usual energetic and enthusiastic self. Thank you.

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3 Answers

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on October 17th, 2019

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question bout Ruari. Poor boy. Respiratory infections are typically caused by viruses in cats. First, you can try starting him on an L-lysine supplement - this is an amino acid that has been shown to help the immune system fight off respiratory infections more effectively. Enisyl and Viralys are both good brands, and can be purchased over the counter without a prescription - just follow the dosing instructions on the label based on your cat's weight. If he's congested, you can also try using a humidifier or bringing him into the bathroom with the door closed while you take a hot shower - the steam and humidity help to break up congestion and temporarily relieve symptoms associated with respiratory infections. Finally, I'd have him seen by a vet to get medication to help with his symptoms. I hope this helps!

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    Answered By Dr. Strydom, DVM

    Veterinarian

    Published on December 29th, 2017

    It's likely an upper respiratory infection due to the feline herpes virus (or another virus). It manifests when they are stressed and Whiskers was probably stressed that you guys were gone. This is very common in cats. Sometimes they will have mild signs like he does and sometimes they will have severe signs like crusted eyes and thick ocular/nasal discharge. I suggest you get him an immune booster supplement like one of these and start him on it: https://www.chewy.com/vetriscience-vetri-dmg-immune-health/dp/42657 https://www.chewy.com/vetriscience-vetri-lysine-plus-immune/dp/42647 He should continue this supplement forever. If at any time he seems like he is worsening, not wanting to eat/drink, extremely lethargic, etc then you should get him to your vet ASAP. Best wishes!

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    Answered By Destini R. Holloway, DVM

    Veterinarian

    Published on December 8th, 2018

    Yes it is possible for a cat to get an infectious viral infection that cause an upper respiratory infection. This often occurs in cats that are allowed to go outside. If he is still eating well and has no vomiting, then it likely will be ok to have him checked on Monday during his vet appointment. However, if he has other symptoms of concern, it may be best to have him seen by a vet that is open on tomorrow to ensure he gets treatment right away to help stabilize his condition. I hope that your fur baby Blondie feels better soon! Best wishes and take care.

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