How to order


Always discuss with your veterinarian if Polyprenyl Immunostimulant™ is right for your cat.

How to order Polyprenyl Immunostimulant™
US online orders only

Polyprenyl Immunostimulant™(PI, PPI) is a medication that requires a prescription.
If you need Polyprenyl Immunostimulant™ urgently and cannot get the signed order form or prescription from your veterinarian immediately, you may still proceed with your order*. Please follow the steps below and we will process and ship your order without delay.
By placing the order, you agree to supply us with a valid Rx.



Select the size (vials or packs) and quantity for your Polyprenyl order. Polyprenyl Immunostimulant™ is sold by 10mL vials and packs of 6X10mL vials. When placing your order, please make sure to select vials or packs to suit your needs. Add to cart, and when ready, proceed to checkout.

How much Polyprenyl Immunostimulant™ you need to order depends on your cat's condition:

Your veterinarian has advised you on the dosage of PI based on cat's condition. Use our calculators to find out how many vials to order:
For USDA-approved FVR/URI treatment, please use our FVR calculator. For Feline Infectious Peritonitis (FIP), please use your veterinarian's advice and Dr. Legendre's trials. Our FIP calculator is based on Dr. Legendre's research.



Please fill out your pet and veterinarian information (below the Billing and Shipping sections) on our checkout page. This gives us the preliminary information we need to process and ship your order without delay*. You will send us your Rx separately (see step 3).

Save on your first order:

First-time online customers save 10% by entering WELCOME10 at checkout.

Send your RX


After placing your order, send us your veterinarian's order authorization/Rx, referencing your order number.

Order form/prescription form:

The easiest option is to have your veterinarian fill out our Veterinarian Online Authorization Form on your behalf directly from our website.

Alternatively, you can download our online order form and have your veterinarian sign it. We will also accept a regular prescription from your treating veterinarian.

Where to send your prescription (choose your prefered option):

- Send your prescription in digital format (pdf, scan, photo) by email.
- Fax a copy to us at 1-865-940-0042
- Mail to our address: VetImmune® • P.O. BOX 205 • Kingston, TN 37763
Please make sure to reference your order confirmation number so we can match your records.

10mL vials (sold by 2 vials or 3 vials)

Suitable for a single cat or kitten being treated for FVR/URI for an average 2-weeks treatment.​

6-vials pack

Suitable for multiple cats household with several cats/kittens suffering from FVR/URI or for a cat starting treatment for FIP (single pack), or multi-packs for prolonged use (larger amount means savings.)​

IMPORTANT INFORMATION: VetImmune® always recommends that cat guardians establish diagnosis and order Polyprenyl Immunostimulant™ through their veterinarians. VetImmune® is also an ethical company: we believe cat health and well-being issues are paramount. The impact of the recent COVID-19 pandemic is still felt by all of us, including veterinarians and specialists who face an increased workload and reduced availability. As a result, we now conditionally accept orders for Polyprenyl Immunostimulant™ prior to veterinarian consent to allow access to urgently needed treatment as early as possible.