Famciclovir (Generic) Tablets

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Strength: 250-mg
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Count: 1 tablet

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Famciclovir is a generic anti-viral used to treat symptoms of the herpes virus. Typically prescribed for humans, veterinarians often use to treat upper respiratory and ocular diseases in felines.


Famciclovir may improve clinical outcomes in felines infected with herpes virus type 1 (FHV-1).

Possible Side Effects

Possible side effects of famciclovir may include decreased appetite and increased amounts of urine. Any side effects should be reported to your veterinarian.

Drug & Food Interactions

Talk to your veterinarian about any other drugs your pet is taking before starting this medication, including but not limited to probenecid.


Famciclovir is contraindicated in patients known to be hypersensitive to it or penciclovir. It should be used with caution (and dosage adjustment) in patients with renal dysfunction.

This drug is FDA-approved for human use. However, it is common practice for veterinarians to prescribe such drugs for use in cats.

  1. Prescribing Information

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  • Health Condition
    Respiratory Infections
  • Drug Type

Active Ingredients: Famciclovir Inactive Ingredients: Hydroxypropyl Cellulose, Lactose Monohydrate, Magnesium Stearate, Sodium Starch Glycolate Type A Potato, Hypromelloses, Polyethylene Glycol Unspecified, Polysorbate 80, Titanium Dioxide.

Recommended Dosage

Doses ranging from 40 - 90 mg/kg every 8 -12 hours.

The usual dose in dogs is 5 to 10 mg/kg PO once daily (or delivery every 12 hours) with food; recommendations for treatment duration vary and are determined by the infective agent and site of infection. For cats, 5mg/kg PO once daily for 7 days given on alternating weeks for 3 treatment cycles. Cats must be treated during weeks 1,3, and 5and left untreated during weeks 2 and 4. It is recommended to administer the product without food (before the meal) to improve absorption. Please always consult with your veterinarian before administering.

Storage Instructions

Store at 68° to 77°F


What is Famciclovir?

Famciclovir is an antiviral drug used to treat infections caused by herpes virus. In cats, it's known as Feline herpesvirus type 1 (FHV-1).

How is this medication given?

Your pet's dose is determined based on his/her specific needs. Always follow your veterinarian's precise instructions. Try giving without food, but if cat vomits or acts sick after receiving the medication, give with a small amount of food.

What results can I expect?

FHV-1 infections are controlled, not cured, and recurrence may occur even if your cat is treated life-long.

Rating: 4.8 of 5 stars 5 Reviews 5 Reviews 4.8 out of 5 Stars

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Rating: 4.8 of 5 stars 4.8 / 5

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  • 5 out of 5 stars

    Kicked the virus!

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    One of our 4 cats had herpes/calici virus symptoms all summer long. The other 3 cats were battling the virus on their own without medication; however it hit 11 year old Merry very hard. 2 courses of antibiotics cleared the bacterial infection but the virus symptoms remained. Thankfully Famciclovir improved and then relieved him of all symptoms. We are almost finished with a 2 week course and he is symptom free and returning to normal. This is a God-send for him!

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  • 5 out of 5 stars

    Great price

    By on

    I nearly fell over when the pharmacy told me they wanted $ 148.00 for this prescription for my cat. Checked online and found it on sale at Chewy for about $12.00 ! Was very simple to get the vets prescription to them and it was delivered quickly. I thank you and my cat thanks you too !

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  • 5 out of 5 stars


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    Very happy with my purchase! My cat is too. I was extremely happy that Chewy was able to obtain this medication , at a reasonable price, to help my very ill cat.

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  • 4 out of 5 stars

    Seems to work well

    By on

    My cat has feline Herpes with recurrent sinus infections. Usually an antibiotic helps, but he was on 2 different antibiotics and no improvement so the Vet prescribed this and it is helping. I just wish that I could have emailed the script instead of sending it by mail, priority mail because I needed it fast.

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  • 5 out of 5 stars

    Feline Herper

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    Very effective for a very persistent illness. Chewy delivered it fast. If you have a problem giving pills to your cat...try a Pill Popper, like a syringe, but you put the pill in it. I only see one on Chewy, I got mine from another retail giant...more options there. With very little struggle, I was able to give my cat all the pills, that would have be impossible without the tool.

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