Vetoquinol Viralys Gel Immune Supplement for Cats, 5-fl oz

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About This Item

Details

  • A highly palatable L-Lysine HCI Nutritional supplement for cats that may be given orally twice a day
  • This L-Lysine supplement is specifically developed for cats and kittens in mind
  • A nutritional supplement for conditions responsive to Lysine such as upper respiratory problems or feline herpes virus
  • This oral gel will also help reduce inflammation of the eyes, conjunctivitis (eye discharge), squinting sneezing, sinus congestion, and so much more
  • Made in Canada and manufactured according to rigorous pharmaceutical standards, L-Lysine powder can be safely administered with no known side effects for as long as required

Ingredient Information

Instructions

FAQ

Learn More About Vetoquinol From Our Team of Experts

Vetoquinol Viralys

Viralys L-Lysine Supplement for Cats

Support your cat’s immune system with Viralys L-lysine supplement! The key ingredient, lysine, supports normal eye health, respiratory health, and helps your cat maintain a strong immune system

Viralys can help cats manage conditions responsive to lysine, including:

Squinting, watery, red, and/or itchy eyes

Sneezing

Runny nose

Congestion

For Cats and Kittens          

Viralys can be given to cats and kittens of any age to support a healthy immune system.

Maintain Eye Health Support

L-lysine helps support normal eye function and health in cats and kittens.

Respiratory Health

Viralys is formulated to support respiratory health in cats and kittens.

Easy to Give

Even picky cats love the tasty maple-flavored oral gel or fish and poultry-flavored powder!

Satisfaction Guarantee

The makers of Vetoquinol are so sure your pet will like their products that they come with a 100% satisfaction guarantee.

Also Try Enisyl-F!

From Vetoquinol, Enisyl-F L-lysine supplement helps support immune health in cats and kittens of all ages.

Cats love the tasty chicken liver flavor of the easy-to-give bites or the tuna-flavored oral paste - giving you more options for high-quality immune support.

About Vetoquinol

Vetoquinol believes that a healthy pet is a happy pet. That’s why they are committed to creating uniquely formulated products that are easy to administer and designed to foster good health at every life stage. Since 1933, this independent family business has been on a mission dedicated exclusively to animal health. Their goal every day is to enrich the lives of pet parents by helping their pets be well and thrive!

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Questions & Answers

24 Customer Questions


Is this Maple Flavor?? The Viralys we've been using is maple flavor and they love it. Don't want to take a chance with a change. Thank you.

Answer by ChewyFeb 27, 2018
This gel is Maple Flavor.

Does viralys lose its effectiveness after expiration date?

Answer by ChewyDec 12, 2019
We recommend using the oral gel prior to expiring for the safety of your pet.

Can I add the gel formula to my cats food? If so does it diminish the potency of it?

Answer by ChewyJun 04, 2019
This gel can be added to the cat's food, administered directly into their mouth, or smeared on their paw so they lick it off.

Do u supposed to give this to cat even after. hes better

Answer by ChewyDec 19, 2018
L-Lysine powder can be safely administered with no known side effects for as long as required.

4.5
Rated 4.5 out of 5 stars
1740 Ratings

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Effectiveness

91% Positive

Form and Administration

88% Positive

Ingredients

87% Positive

Nutritional Value

82% Positive

971 Customer Reviews



Rated 1 out of 5 stars
By Richard on Mar 23, 2026

Why do they flavor these?

I bought this hoping to save a couple bucks, I did not see that it's "maple" flavored. Why do companies do this? Cats do not have the receptors for sweet, let alone

I bought this hoping to save a couple bucks, I did not see that it's "maple" flavored. Why do companies do this? Cats do not have the receptors for sweet, let alone care, not one cat will finish the food I put this in. I'm guessing the best way is to force them with a syringe as to not waste the rest of it. I cannot recommend this solely on the fact it's flavored with something other than beef, chicken, lamb, or fish, or just leave it alone and make it flavorless, which we have the technology to do, then that would solve most animals tastes.


Rated 1 out of 5 stars
By Claudia on Feb 27, 2026

Maple????

I'm sure that this is a quality item, but both of my kittens who need it thought that the smell was repulsive. I put it on their nose. They almost lost their mind!

I'm sure that this is a quality item, but both of my kittens who need it thought that the smell was repulsive. I put it on their nose. They almost lost their mind! I smeared it on there front paws and they just shook them maniacally. Nobody wanted to lick it off! Maybe Maple isn't the best flavor. Maybe it should be salmon? Or beef? Whatever it is about this gel they won't touch it!!


Rated 5 out of 5 stars
By Alyse on Feb 5, 2026

Palatable L-Lysine Supplement

I have had several cats who needed L-Lysine supplements. Some were willing to take the supplement in powdered form mixed into wet foods, but administering a complete

I have had several cats who needed L-Lysine supplements. Some were willing to take the supplement in powdered form mixed into wet foods, but administering a complete dose always was subject to whether or not they felt hungry enough or happy enough with the selected flavor du jour to finish eating the portion I had given them. The Viralys gel is easy to administer, and I know I have given a full dose. If my cat does not want to lick the complete dose off my finger, I gently can place the gel just behind her upper incisors for her to complete the dose.


Rated 5 out of 5 stars
By Elizbeth on Jan 29, 2026

Works quick

So my one cat has had the virus that has affected his respiratory system since birrh. My vet has told me he would need to be on lysine for life to help prevent

So my one cat has had the virus that has affected his respiratory system since birrh. My vet has told me he would need to be on lysine for life to help prevent flareups. He used to eat the treats..then he started refusinf aftwr a few years. i tried different brands. Nope. He has had a flareup for awhile. Sneezeing, snotty. I didnt know the gel was available till recently. This cat eats anything except for this. However i mix it in his wet food in the morning and he eats it right up. Hes only been taking it like 5 days but it has helped him so quick, i feel bad i didnt find this sooner.


Rated 3 out of 5 stars
By Mary on Mar 23, 2026

Cat did not appreciate my effort

My cat was repulsed by the smell. That's probably why my vet said to get the powder. I gave it three stars because a different cat decided it was just fine. Unfortunately

My cat was repulsed by the smell. That's probably why my vet said to get the powder. I gave it three stars because a different cat decided it was just fine. Unfortunately he's not the cat that needed it!


Rated 1 out of 5 stars
By Stacie on Feb 26, 2026

Made 3 of my cats sick

Bought this to help 3 of my cats who were having severe symptoms from Calicivirus. All three started throwing up and continued for two days. Not sure if I received

Bought this to help 3 of my cats who were having severe symptoms from Calicivirus. All three started throwing up and continued for two days. Not sure if I received a bad batch from manufacturer, I realize this happens. Disappointed. Had to throw away.


Rated 5 out of 5 stars
By Kime on Mar 9, 2026

This stuff works!

I give this to my Persian cat for his herpes every morning and he loves it and loves the taste. I just squirt a little bit on a couple of treats and he just eats

I give this to my Persian cat for his herpes every morning and he loves it and loves the taste. I just squirt a little bit on a couple of treats and he just eats it right up.


Rated 5 out of 5 stars
By anita on Feb 12, 2026

Outstanding supplement

I have noticed an remarkable improvement in both my cats. They are not sneezing as much and their noses are not running at all. Their eyes even look better. They

I have noticed an remarkable improvement in both my cats. They are not sneezing as much and their noses are not running at all. Their eyes even look better. They both have feline herpes. Cheaper than buying at the vet.


Rated 3 out of 5 stars
By Evelyn on Jan 16, 2026

It smells terrible

Who thought that maple would be a good flavor that would appeal to cats?? Maple! The cat hates it. It does seem to have helped a little with his chest congestion

Who thought that maple would be a good flavor that would appeal to cats?? Maple! The cat hates it. It does seem to have helped a little with his chest congestion but now he avoids me because he doesn’t want me to give him that awful stinky stuff near him again. This is as good as science can do for cats? I’m looking for something that will not make my cat think that I am poisoning him.


Rated 5 out of 5 stars
By Connie on Mar 11, 2026

Speedy shipping

This is a great supplement for my cats, they love it. I found the website to be easy to navigate and purchase from and then paired with speedy delivery.

This is a great supplement for my cats, they love it. I found the website to be easy to navigate and purchase from and then paired with speedy delivery.