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

Skip image gallery
Slide 1 of 12

At a Glance

  • Immune Support
  • Eye Care
  • All Lifestages

$14.03 First Time Autoship Price
this order
Save 40% (up to $20) today when you set up Autoship. 
$22.22 Autoship Price
(-5%) future orders
  • Keep saving 5% on every order
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$23.39 Chewy Price
($4.68 /fl oz)
Save $2.60 (-10%)
$25.99 List Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME
In Stock
FREE 1-3 day delivery on first-time orders over $35
Free 365-day returns

No interest if paid in full in 6 months on PayPal purchases of $149+. .

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!

Shop Vetoquinol

Frequently bought together

Questions & Answers

22 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 Chewy • Feb 27, 2018
This gel is Maple Flavor.

Does viralys lose its effectiveness after expiration date?

Answer by Chewy • Dec 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 Chewy • Jun 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 Chewy • Dec 19, 2018
L-Lysine powder can be safely administered with no known side effects for as long as required.
Reviews
Write a Review
4.5
Rated 4.5 out of 5 stars
1673 Ratings
Terms & Conditions

Customers Mention

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

Effectiveness

92% Positive

Form and Administration

88% Positive

Ingredients

87% Positive

Nutritional Value

81% Positive

951 Customer Reviews

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 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 Pamela on Jan 16, 2026

Amazing

The vet prescribed this as a supplement when my cat had an upper respiratory infection. It will NOT treat an infection. I use this if they start sneezing or watery

The vet prescribed this as a supplement when my cat had an upper respiratory infection. It will NOT treat an infection. I use this if they start sneezing or watery eyes. It is just a supplement but really seems to help. 3-5 days usually. I keep a tube on hand.

Rated 1 out of 5 stars
By Alisson on Jan 27, 2026

My cat hates it

Who in their right mind thought of making this maple flavored for cats?! My cat gags at it every time I try to give it to him. He runs every time he sees me getting

Who in their right mind thought of making this maple flavored for cats?! My cat gags at it every time I try to give it to him. He runs every time he sees me getting near him with the gel. I do have to force him to take it. I'll not buy again :(

Rated 5 out of 5 stars
By Andy on Dec 13, 2025

Vet Recommended

Our rescue kitten had really bad upper respiratory infection that required two rounds of steroids. Our vet prescribed a lysine supplement and recommended we continue

Our rescue kitten had really bad upper respiratory infection that required two rounds of steroids. Our vet prescribed a lysine supplement and recommended we continue to keep her healthy and it absolutely makes a difference. If she doesn’t get it everyday, she is susceptible to illness and that is not some we are willing to risk (not to mention the vet costs we’re avoiding with the proactive treatments).

Rated 5 out of 5 stars
By Santana on Dec 29, 2025

Showed up fast and at a great price

I have to get things for my cat including toothpaste cause my cat is allergic to his own plac on his teeth and getting it from the vet i get a way smaller amount

I have to get things for my cat including toothpaste cause my cat is allergic to his own plac on his teeth and getting it from the vet i get a way smaller amount for a few hundred and on chewy I found his exact meds for 25 dollars and 15 dollars !! So I save money and a dramatic vet trip for my cat

Rated 3 out of 5 stars
By Lacey on Jan 18, 2026

Cat did not like

I felt confident with all the positive reviews that my cat would like this. But, he didn’t. He ran away every time I tried to give it to him. I was able to return

I felt confident with all the positive reviews that my cat would like this. But, he didn’t. He ran away every time I tried to give it to him. I was able to return the item and customer service was great to work with.

Rated 5 out of 5 stars
By Jay on Nov 24, 2025

Keeps the cat healthy

Sunny was put onto this supplement when he a few months old, it has kept his eyes and nose clean ever since. He usual uses the powder but he has to have the gel

Sunny was put onto this supplement when he a few months old, it has kept his eyes and nose clean ever since. He usual uses the powder but he has to have the gel due to his newly developed allergy of chicken. The powder works well but due to it having chicken flavoring he can't have it so this is also great for cats who can't have any chicken. You can also mix it with their wet food if the cat doesn't want to eat it by itself.

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

Helps with sniffles

Vet prescribes 1/8 tsp twice a day. Alit smaller than what I read ... but it is doing the trick. She said to continue indefinitely Hope that's OK

Vet prescribes 1/8 tsp twice a day. Alit smaller than what I read ... but it is doing the trick. She said to continue indefinitely Hope that's OK