HerpX™ delivers 180 mg of famciclovir in small coated tablets sized for weight based dosing in cats. It gives owners a practical alternative to splitting human cold sore tablets when a cat is in the middle of a Feline Herpesvirus (FHV-1) flare.
Built for cats, not adapted from human medicine
Famciclovir is a prodrug of penciclovir, a nucleoside analogue with demonstrated activity against Feline Herpesvirus (FHV-1). It is regarded as systemically safe in cats when dosed appropriately, which is an important distinction from acyclovir and valacyclovir, human antivirals associated with toxicity in cats. HerpX™ is intended for feline use under veterinary guidance only.
Supported by published feline research
Famciclovir use in cats is backed by a body of published feline pharmacokinetic and clinical work, including dose optimisation modelling and a 59 case clinical series covering ocular, respiratory and dermatologic disease attributed to Feline Herpesvirus (FHV-1). That evidence base informs the widely cited dosing approach of approximately 90 mg/kg every 12 hours used under veterinary direction.
Where HerpX™ is used
- Ocular flares, including conjunctivitis and corneal disease
- Upper respiratory flares, including sneezing, nasal discharge and congestion
- Recurrent flares triggered by stress
A note worth reading
Feline Herpesvirus (FHV-1) stays in the body after the first infection and can flare again when a cat is stressed, unwell or in a new environment. Treatment is about controlling flares and protecting your cat's eyes and comfort, and many cats need a plan for managing recurrences rather than a single course.