Polyprenyl Immunostimulant™ (PI) is USDA licensed in the US for the treatment of Feline Viral Rhinotracheitis (FVR).
VetImmune PI™ is registered in the EU for the treatment of Feline Herpesvirus infection (FHV-1) and Feline Infectious Peritonitis (FIP).
WE LISTENED TO YOU: POLYPRENYL IMMUNOSTIMULANT™ LABEL UPDATE 07-2022
We thank veterinarians and cat owners for sharing their experiences and recommendations so that we continue to improve the performance of Polyprenyl Immunostimulant™. Based on your feedback and data, we learned that the addition of antibiotics markedly increases the success of treatment, especially in chronic URI patients. Therefore, we added and the USDA approved the following recommendation on the label of Polyprenyl Immunostimulant™ to treat feline rhinotracheitis:
“Appropriate concurrent antibiotic use may be needed in the presence of secondary bacterial infections.”
The label change is an important step toward a more robust performance of Polyprenyl Immunostimulant, and we look forward to hearing about your experiences.
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HEALTHY CATS ARE OUR BUSINESS
Polyprenyl Immunostimulant™ (PI) is the only therapeutic licensed in the the US by the USDA for the treatment of Feline Viral Rhinotracheitis (FVR). VetImmune PI™ is registered in Czechia (EU) for the treatment of feline herpesvirus (FHV-1) and Feline Infectious Peritonitis (FIP).
Polyprenyl Immunostimulant™ is a safe and effective treatment option that works by upregulating innate immunity and directing cellular immune response.

Viral diseases and the immune system
Immunostimulating (immunomodulatory) medicines are a new, cutting edge development designed to rebuild the damaged immunity and direct it against the invading viruses. In some instances, an antiviral drug may be needed in addition to an immunostimulant drug, but won’t replace it, because suppressing the agent of the disease does not restore the immune system..


Seven reasons why
Your cat needs Polyprenyl Immunostimulant™
How can Polyprenyl Immunostimulant™ benefit your cat? Why should you choose it to improve the health of your companion? Here are seven compelling reasons why:
Does your cat have FVR?
Feline viral rhinotracheitis (FVR, FRV, FHV-1) is a common and ubiquitous upper respiratory infection (URI). Polyprenyl Immunostimulant™ is a proven product for the treatment of Feline Rhinotracheitis, designed with cats and their guardians in mind.


FIP Research
Consulting with the USDA, Sass & Sass, Inc. has been designing and is getting ready to conduct a new FIP efficacy study in parallel with the study of Polyprenyl Immunostimulant™ for herpetic ocular disease.
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FVR Research & Trials – FIP research and Trials
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* Polyprenyl Immunostimulant™ is not or may not be available in a small number of countries due to country-specific regulations or contractual limitations.