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Vetoquinol Viralys (L-Lysine) Powder (600 grams)
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Vetoquinol Viralys (L-Lysine) Powder (600 grams)

Item: V026457
Availability: In Stock

Was: $158.99$121.99You Save: $37.00!(23%)


Nobody wants their cat to suffer from a virus, but unfortunately, some cats develop feline herpes and feel the effects, regardless. This virus has no effect on humans, dogs or other pets, but it can be a serious breathing problem for cats, and it can also cause conjunctivitis in feline ocular systems.

Vetoquinol Viralys (L-Lysine) Powder (600 grams) meets the needs of a Lysine supplement which is a known help in cat herpes virus treatment, both for respiratory and eye symptoms. As an antibiotic, the powder can be ingested by a cat for systemic treatment and protection, and help control the effects of the virus in the affected feline patient.

Packaged in 600-gram containers for multiple doses with one order, Vetoquinol Viralys Powder in tasty flavors, convincing cat patients to take their medicine without a fuss. This is a good thing since, as any cat owner knows when a cat doesn't want to do something their fish-hook claws and teeth emphasize the point clearly in case there was any confusion on the matter.

While reducing your cat's stress and anxiety in its home environment will keep the virus symptoms to a minimum, having Vetoquinol Viralys Powder on hand will also contribute to a healthier, furry friend and a longer feline life.


Active Ingredients Pet Scoop: L-Lysine Hydrochloride ...... 500mg

Inactive Ingredients: Brewer's Dried Yeast, Hydrolyzed Fis (enzymatic), Hydrolyzed Poultry Liver (enzymatic), Mixed Tocopherols (a preservative), Sodium Acid Pyrophosphate, Sodium Sulfate.

Useful Information

Administration: One rounded scoop contains approximately 500mg of L-lysine Hydrochloride in a palatabe base. The suggested amount for cats over 6 months of age is one rounded scoop given orally twice daily. The suggested amount for kittens under 6 months of age is 1/2 scoop given orally twice daily. Adjust amount based on veterinary recommendations.

Use: For use in cats & kittens as a nutritional supplement for conditions responsive to Lysine.

Feline Herpes Virus

What is feline herpes virus?
Feline herpes virus is an upper respiratory virus of cats. It is also known as rhinotracheitis virus. It is very common among cats, especially in environments where there are multiple cats or new cats are constantly interacting. The virus is spread through the air and replicates in the upper respiratory tract (nasal area, tonsils). The conjunctiva of the eye is also affected during the primary infection which results inconjunctivitis. Clinical signs of infection include sneezing and ocular and nasal discharge. In most cases the primary infection resolves with no residual ocular lesions. However, depending on the age when the cat is affected, the serotype of the virus (infectivity or strength of infection), and other factors, there may be various ocular signs. In very young cats, adhesions of the eyelids to each other or to the cornea may occur. Adult cats may experience recurrent conjunctivitis or corneal ulcers. The virus remains latent in the nerves that serve the eyes. When a cat is stressed or exposed to new serotypes (different strains) of herpes virus, the ocular disease can recur. There is some evidence that eosinophilic keratitis, plasmacytic-lymphocytic keratitis, corneal sequestrum, and some cases of anterior uveitis may be associated with feline herpes virus infection.

How do cats get feline herpes virus?

Most cats are affected as kittens, contracting the infection from their mothers. Stray cats, multi-cat households, and cats from households where new cats are constantly introduced are more likely to suffer infection. Feline herpes virus is not contagious to dogs or to humans but only affects cats.

How is feline herpes virus diagnosed?

History and clinical signs can diagnose ocular diseases caused by feline herpes virus. Aside from history and clinical signs, diagnostic tests for feline herpes virus include virus isolation, immunofluorescent antibody testing, polymerase chain reaction testing, serology, and cytology. Testing can be expensive and is generally reserved for specific cases. Tests that may not specifically detect the presence of herpes may be used to detect ocular disease caused by herpes. These tests include a Schirmer tear test (measuring tear production), corneal staining, and conjunctival biopsy.

How is feline herpes virus treated?

Treatment for feline herpes virus infections is nonspecific and generally directed at controlling secondary bacterial infection. A topical antibiotic such as tetracycline or erythromycin may be prescribed for use in the eye. Systemic antibiotics may also be prescribed. Oral L-Lysine is recommended by many veterinary ophthalmologists at a dose of 250-500 mg twice daily. Lysine competes with another amino acid, arginine, that herpes virus must have in order to reproduce. Lysine has been demonstrated to decrease the severity of ocular symptoms associated with herpes virus infection (1) and reduce viral shedding during periods of disease recurrence (2). Depending on symptoms, other medications such as topical antiviral drugs, topical polysulfated glycosaminoglycans, topical nonsteroidal anti-inflammatory drugs or topical interferon may be used. In some cases the ocular diseases resulting from feline herpes virus may require surgical intervention. The key to managing the clinical signs associated with feline herpes virus is controlling the cat's environment. Cats exposed to multiple cats (indoor-outdoor cats), cats in multiple cat households, or cats that are frequently introduced to new cats are difficult to keep disease free. Reducing stress by maintaining a stable routine is helpful in preventing recurrences of disease. Keep in mind that it is the nature of the virus to see recurrences of the disease and periodic treatment is often necessary.


WARNINGS: For animals use only. Keep out of the reach of children and animals. In case of accidental overdose, contact a health professional immediately. Store in a cool, dry place.

CAUTIONS: Safe use in pregnant animals or animals intended for breeding has not been proven. If animal's condition worsens or does not improve, stop product administration and consult your veterinarian.

Customer Reviews

Review Summary
10 Reviews
90% (9)
10% (1)
0% (0)
0% (0)
0% (0)
70% Recommend this product (7 of 10 responses)
By SueAnn
Great product
December 22, 2021
My friend suggested this product for my cat colony, & it is great at keeping the feline virus to a minimum when rescuing multiple cats from different areas & they become part of your family cat pack, rate A+ will continue to purchase as long as its available & have multiple cats to treat, thank you
By Jaynee
Hong Kong
Very good deal
July 13, 2017
Have been using this for few years. Very good for preventing cat flu.
By Mitzie
Works great
November 27, 2016
My vet prescribed this product for my cat who has FIV. It took a long time to see results (vet said it would!) but once it kicked in kitties sinuses cleared up and he felt better over all. I have been using it for at least 2 years.
By Trish
Wasilla Alaska
Great product for my cat
June 26, 2016
My cat has feline AIDS and this product is great.
By George L.
February 11, 2016
thank you for the fast service
fast service
By Mack
Redford, Mi.
lung problem
September 19, 2015
Has had a bad cough for about 9 Mo. Responded poorly to antibiotics. Read somewhere that L-Lysine was good for lungs and breathing, so I gave it a try. My cat is much improved, still coughs but much better than he was. He is 17 years old and is eating good again, has gained some weight and is playful again. I would recommend this product and would give it 4 1/2 starts.
All Good Noon
By Gertie
Pueblo, CO
Awesome Product!
August 18, 2013
I am a licensed feral cat colony manager w/35 cats and this product has literally been a life saver for all of us! I add this to their food daily and not one cat has been sick in over a year! Because they are all outside and roaming, they probably come into contact with many strays that are sick and yet this product keeps them healthy. AMAZING!
By Fran
It works
August 1, 2012
If you have cats with herpes that flares occasionally then you need this product. The powder is so fine that they don\'t even know it\'s there, even on dry food. I don\'t use it all the time but have been using it recently because one of my \"boys\" had an outbreak of herpes and was sneezing and congested. Putting a scoop of this on their food twice a day always seems to help within 2-3 days. And the 100 gram size lasts a long time and is VERY economical. I have also used the paste but the powder is less stressful to the cats because mine have to be forced to eat the paste.
By Lois G.
Great stuff!
December 20, 2010
I do cat rescue and so have 11 cats now. Once a virus spread from cat to cat and my vet recommended this. I have kept them on it so it never happens again. Once was enough. It cured all of them and now they stay healthy. I sprinkle it on their canned food & they love it.
By Betty
really works!
December 16, 2008
My Burmese baby has had a runny nose since we brought him home. He was diagnosed with latent Herpes. Our Vet who recommended Viralys following a rather bad \"cold\" at age 4years. MoMo is much better! He still has an occassionaly runny nose but much better than before.

Customer Q&A

1 Question & 1 Answer
Jaymee wong
from Hong Kong asked:
January 1, 2019
Expiry date
1 Answer
Hello Jaymee, please contact our customer service at 1-800-889-9475 and they will answer any questions that you have.
Submitted by: Customer Service on July 8, 2019