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Famciclovir (Famvir)

Buy Famciclovir 125mg, 250mg or 500mg for your cat

Prescription required - send to us by post
Our score 4.7 ‘Excellent’ 23,797 patient reviews Prescription required - send to us by post
Select Medicine
Branded famvir for Pets
Package size
10 tablets (£99.99)
£99.99 Delivery included
Send us your prescription and we dispatch treatment on the same day.

How it works


Order your treatment

Select the treatment for your pet and place the order.

Save up to 60%

Send us the prescription

Then post your original prescription to our UK pharmacy.

No stamp needed

Free delivery

Once our pharmacy receives your prescription, we deliver your treatment the next day.

No prescription yet? Download a blank version.

Product information

What is Famciclovir (Famvir) used for in cats?

Famciclovir is an antiviral medication used to treat viral infections in pets, such as feline herpesvirus. Famciclovir works by preventing the viral cells from multiplying, which can help reduce the severity and duration of symptoms. Famciclovir can help control feline herpesvirus infections, which can cause eye problems and upper respiratory tract symptoms, as well as canine distemper virus infections, which can cause neurological signs such as seizures. Always speak with your veterinarian about the benefits and risks of using Famciclovir in your pet.

Is Famciclovir (Famvir) for animals the same as for humans?

Yes, Famciclovir for animals is the same medicine as Famciclovir for humans. However, your pet should only be given Famciclovir if specifically prescribed by a veterinarian, as it will need to be administered differently.

What is the dosage of Famciclovir (Famvir) for cats?

The dosage of Famciclovir for pets depends on the type, severity, and duration of infection. You must follow your veterinarian’s instructions when administering this medication. The typical dose range for oral administration in cats is 8-30 mg/kg divided twice daily or 10-20 mg/kg once daily. Your veterinarian will determine the exact dosage for your pet.

At HealthExpress, Famciclovir is available as 125mg, 250mg and 500mg tablets.

How do I give my cat Famciclovir (Famvir)?

Famciclovir can be administered in tablet form orally. Always follow your veterinarian’s instructions when administering this medication, as improper dosage could cause serious side effects or even death. If you are giving Famciclovir orally, ensure that your pet swallows the tablet and does not chew it.

How long do Famciclovir (Famvir) take to work in cats?

The effects of Famciclovir can vary depending on the type, severity, and duration of infection. In general, it takes 1-2 weeks for the virus to be fully eliminated from an infected animal. It is important to follow your veterinarian’s instructions closely when using this medication in order to maximize its effectiveness.

What are the side effects of Famciclovir (Famvir) in cats?

The most common side effects of Famciclovir in cats include vomiting, diarrhoea, and loss of appetite. Less common side effects could include liver toxicity or kidney damage. If you notice any side effects after giving your pet Famciclovir, contact your veterinarian immediately.

Where can I buy Famciclovir (Famvir) for my cat ?

Famciclovir is a prescription medication, so it can only be obtained via a prescription from a vet. Once a prescription has been issued, Famciclovir can be purchased from either the vet clinic or a pharmacy. Online pharmacies such as HealthExpress accepts vet prescriptions, so you can order your pet's Famciclovir treatment conveniently online at an affordable price.

How do I order Famciclovir (Famvir) for my cat at HealthExpress?

If you have a veterinary prescription for Famciclovir, simply add the medicine to your basket and complete your order. You must ensure you have selected the correct dosage and quantity prescribed by the vet. Then, you will need to send us the original vet prescription before we can dispatch your pet's treatment.

Online UK pharmacy since 2002

For 20 years we have offered treatments to over 2.1 million people. More and more our patients asked us to also provide medication for their pets. So here we are: offering our safe, quick and affordable service for your paw-friends too.

23,797 Reviews
12 Apr

Overall it was a good service, I got my medication next day and was kept up to date. The only thing that surprised me was a very limited expiry date 6 months I think. I really think it should be at least a year. Just in case you need the medication again after it's intended use.


12 Apr

Clear concise questionnaire. Prompt decision and delivery.

Susie Norton

12 Apr

Fast delivery an is working well so far

Donna Westall

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