Mar Vista Animal Medical Center

3850 Grand View Blvd.
Los Angeles, CA 90066

(310)391-6741

www.marvistavet.com

FAMCICLOVIR

(for veterinary information only)

 

BRAND NAME: FAMVIR

 

Available as
25 mg, 125 mg and 500 mg
TABLETS

 

BACKGROUND

We have had antibacterial antibiotics since World War II but antiviral medications have been more elusive. Only in recent years have meaningful medications been developed. Famciclovir is a human medication developed to treat herpesvirus infections in humans. It turns out to have activity against herpesvirus in cats. Famciclovir works by interfering with DNA replication in the herpesvirus. This prevents the virus from multiplying but famciclovir cannot actually kill the virus nor can it eliminate a herpes infection.

HOW THIS MEDICATION IS USED

Animal use of this medication is new and doses are still being worked out. We do not presently know about long term safety use but courses lasting 2-3 weeks seem practical.

SIDE EFFECTS

Humans report upset stomach and headache as the most common side effects. We do not know if this holds for cats. Some cats have shown appetite loss.

 

CONCERNS AND CAUTIONS

Famciclovir should be given on an empty stomach for best absorption but can be given with food if there is an issue with upset stomach.

Dosages should be reduced in patients with reduced kidney function.

Page posted: 6/11/2018