Skip to main content
Black and white kitten who may be ill

Treatment for feline herpes virus

Q: I found a kitten I’ve named Maynard who is sneezing and has pus coming from his eyes and nose. My friend said Maynard has an upper respiratory infection caused by a virus, and that lysine will kill the virus. What do you think of lysine?

A: The clinical signs you describe are common with an upper respiratory infection, but I haven’t actually examined Maynard, so I can’t make the diagnosis.

Some upper respiratory infections in cats are caused by the feline herpes virus, and initial studies suggested that lysine might be an effective, safe therapy. However, subsequent, more rigorous research has shown this not to be the case, and lysine is no longer recommended for treatment of upper respiratory infections caused by feline herpes or other viruses.

Multiple, comprehensive studies have shown that lysine fails to prevent cats from becoming infected with the herpes virus, suppress clinical signs of the illness, or shorten the duration of the disease. Limited evidence suggests lysine may even worsen clinical signs.

I suggest you make an appointment with a veterinarian who can diagnose Maynard’s problem and make treatment recommendations.

Editor’s Note: Like humans, our feline friends require timely vaccinations and booster shots to keep them safe from diseases such as rabies and feline distemper. Here’s info on critical feline vaccine schedules.


Lee Pickett, V.M.D. practices companion animal medicine. Contact her at askdrlee@insurefigo.com

Protect your pet from the unexpected with Figo Pet Insurance, rated “Best Pet Insurance” by Reviews.com since 2017.

Man sitting on bench with his dog

We believe that seeking out the best...

Small dog being examined by veterinarian

At Figo, we hear this question often...

What do the Cockapoo, the Puggle, the...

Dog receiving treat from woman

August 8th is #NationalCBD day! At Figo...

Advertisement for pet insurance.

More From Figo Blog
Dog and pet parent listening to music in front of speaker

Whether you’re rocking out to your favorite...

Woman drinking coffee and holding small cat near

On any given day, between 50 and 70 million...

Labrador Retriever retrieving a blue frisbee from the yard

One of the best things about owning a dog is...

Woman with dog looking at tablet

Since 2017 Americans have spent between $17...

Small dog sits in front of steps of house

Moving from a 2 bedroom condo in the city to...

Cat scratching on a cat post

You may have heard the phrase, “Cats can’t...