Vetoquinol Viralys Gel Immune Supplement for Cats, 5-oz

By Vetoquinol
Rated 4.3128 out of 5 stars
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About This Item

  • 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 the USA and manufactured according to rigorous pharmaceutical standards, L-Lysine powder can be safely administered with no known side effects for as long as required
Play Video: Learn More About Vetoquinol From Our Team of Experts
Learn More About Vetoquinol From Our Team of Experts

Trusted Immune System Support

Adding L-lysine as a supplement to your cat's diet is an easy way to help support her long-term health. As a market leader with a wide range of L-lysine products, Vetoquinol puts this active ingredient in tasty chews and bite-size morsels, plus paste, gel and powder form so you can find the best way to offer it to your kitty. These supplements are specifically designed for felines to support the immune system, and maintain respiratory an

Seal of Quality

Out of thousands of animal supplement companies, only a hundred are audited NASC members, including Vetoquinol. That means they've undergone a comprehensive quality audit to earn the NASC Quality Seal. Displaying this seal on their products means that you can rest assured that they are committed to following the highest current standards of quality in the industry.

Enisyl-F & Viralys Products

Specially formulated Enisyl-F was the first lysine-based nutritional supplement developed for veterinary use for kitties. Supplementing with L-lysine is helpful for managing the symptoms of upper respiratory infections in kittens and cats that were strays, and those in shelters.


Veterinarian formulated to deliver just the right dose in a treat with cheese, chicken, liver and hickory smoke flavors.


Tiny mouthfuls of L-lysine disguised as a delicious snack with savory chicken fat and chicken liver.

Oral Paste

Highly palatable paste that can be given by mouth, mixed with food, or even applied to paws for your cat to lick off.

Oral Powder

Delivers L-lysine HCl in a powder with fish and poultry liver flavors that cats crave—just sprinkle it on top of food.

Oral Gel

Cats only need a small amount of this extremely palatable gel to get the benefits of L-lysine HCl.

About Vetoquinol

Vetoquinol is a family-owned company devoted exclusively to finding innovative solutions for animal health issues. They've shown more than 80 years of dedication, researching everything from oral hygiene to urinary and kidney health to create products that are effective and safe for the pets you love and care about. Founded in 1933 with an expertise in pet pain management and veterinary resources, Vetoquinol has gained the continued trust of pet parents and vets worldwide.
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Top IngredientsActive: L-Lysine Hydrochloride: 250mg per 1.25 mL., Inactive: Citric Acid, Edetate Disodium...Active Ingredients per 1 scoop (0.52 grams): L-Lysine Hydrochloride ..... 500 mg Inactive Ingredients: Brewer's Dried Yeast, Hydrolyzed Fish (enzymatic), Hydrolyzed Poultry Liver (enzymatic)...Active Ingredients: (Per Included Scoop) L-Lysinehydrochloride 500 mg., Inactive Ingredients: Brewer's Dried Yeast, Hydrolyzed Fish (Enzymatic)...Active Ingredients: L-Lysine Hydrochloride., Inactive Ingredients: Citric Acid, Edetate Disodium...Active Ingredients: L-Lysine (Monohydrochloride), Ascorbic Acid (Vitamin C), Astragalus Root....
LifestageAdult, Kitten, SeniorAdult, Kitten, SeniorAdult, Senior, KittenAdultAdult, Senior, Kitten
Health FeatureImmune Support, Respiratory Care, Eye CareImmune Support, Respiratory Care, Eye CareImmune SupportImmune SupportImmune Support, Respiratory Care, Eye Care
Food FlavorN/AN/AN/AN/AN/A
Special DietN/AN/AN/AN/AN/A
Food FormSupplementSupplementSupplementSupplementSupplement

Questions & Answers

31 Customer Questions

when is this coming back in stock? my cat counts on this gel & it’s been out of stock for a month.
Answer by Jen1Aug 25, 2021
I emailed the company itself a few weeks ago and they hope it will be back in stock in September.

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.

How many adult doses are in one tube?
Answer by ChewySep 03, 2018
It's recommended to give 1/4 teaspoon twice a day or as directed by your veterinarian. This 5 ounce tube contains approximately 60 days worth of doses.

I'm not great with measurements, so if i had a 1 ml syringe, how much of this would i use for an adult cat?
Answer by ChewyNov 02, 2017
For cats over 6 months you'll administer 1.25 milliliters (¼ of a teaspoon) which contains approximately 250 milligrams of L-Lysine. The suggested administration for kittens under 6 months of age is 0.65 milliliters (⅛ of a teaspoon). The doses will be administered twice daily unless specified otherwise by a veterinarian.

ReviewsWrite a Review

Rated 4.3128 out of 5 stars
569 Reviews
Would recommend to a friend

569 Customer Reviews

Rated 5 out of 5 stars
By Jane70 on Jun 20, 2022

Works=But Cat Hates

We have a one year cat that has been sneezing since we adopted him at 6 weeks, and has snotty eyes. The vet finally recommended this, and it works. His eyes and sneezing have improved considerably. The only problem is that he absolutely loathes the stuff. We have to hold him down, and squirt it in his cheeks with a syringe. We also have a seven year old cat that just slept all the time, we decided to give her some, and that cat hasn't been this perky since she was a kitten. She loves the flavor, but she also loves pancakes, so I'm not sure if she's the best judge of the flavor.

Rated 1 out of 5 stars
By DeeCat on Jun 17, 2022

not good for my cat

I’ve been giving this to my cat for a few days now and every time, he throws it up after about 15-20 minutes. He has chronic congestion, sneezing and runny nose and I was hoping this would improve his immune system. Very disappointed that I can’t give this to him.

Rated 1 out of 5 stars
By Cathatesit on May 9, 2022

My cat hates the smell and wont get near it.

I bought this Maple Flavor for my cat who really needs a Lysine supplement and won't eat the chewable ones. I hoped this would solve my problem but my cat hates it SO much I couldn't get it near her. She smelled it. screwed up her eyes and almost ran away. I mean I think now I could only use this as a way to get her off the kitchen counter. Sadly, it didn't work for us.

Rated 5 out of 5 stars
By Chris on May 25, 2022


Princess Uma has occasional bouts of respiratory distress.. Coughing and sneezing. She loves the taste of Vetoquinol and licks it off my finger. When she's not in distress I give this to her 3 times a week unless she starts sneezing in-between then I start up every day.

Rated 5 out of 5 stars
By Melanacious on Apr 17, 2022

My cat goes crazy over Viralys Maple Flavor

I own a cat that had respiratory issues since birth. I was recommended to give her Viralys twice a day. I started her on the maple flavor at 8 months old and she loves it!!!!! She licks it like its candy. As for the other cats I own I have one that would prefer to take the lysine chewable and for the others I would occasionally mix it in their food. Just like us, every cat will have their own preference.

Rated 5 out of 5 stars
By Josi on Mar 6, 2022

It worked better than the powder

It tried a few options before I tried this and it really worked. I tried the powder version first and it didn't work because it has to be mixed in their food and they are completely congested when they first get sick and don't want to eat anything. I learned every cat is different. Our kitten would only take it in his food. Where as our senior cat wanted it by itself and didn't want it mixed in her food. She really liked the maple flavor. I think the maple syrup is strong enough that they can smell it even though they're congested.

Rated 5 out of 5 stars
By Sandra on May 25, 2022

Ozzie feeling better

My cat was pretty sick and vet recommended this and I had already ordered anyway. Between this and my prescription meds Ozzie is 100% better

Rated 5 out of 5 stars
By Bronnie on May 10, 2022

Tasty and effective

My cat considers the gel a treat that he licks off my finger twice a day. This supplement really helps my 2 year-old cat's nasal congestion and weepy eyes.

Rated 3 out of 5 stars
By Meg88 on Mar 1, 2022
Top 50 Contributor

Not a hit for my brood

Unfortunately, out of three cats, not a single one wants anything to do with this gel! Even one of my cats who seems to enjoy 'sweet' things turns her nose up at this, along with my two kittens who don't hesitate to gobble up everything I present to them. I had wanted to try a gel supplement instead of powder as I thought it may be easier, but it looks like I'll have to stick with the powder.

Rated 1 out of 5 stars
By Security on Mar 28, 2022

the won’t eat them

I ordered a combination of the L lysine for the cats and they will not eat the treats and they will not let me get near them with the gel liquid type thing I tried using a syringe and I figure him out 50 bucks because they won’t go near it