Does Cytopoint Get Used Up? How It Differs from Traditional Vaccines
By Dr. Geoff Carullo, DVM, FPCCP, DPCVSCA
One of the most common questions after giving Cytopoint for allergic pruritus is: Does it get used up in the body? And does it work like a vaccine?
The answer is simple: yes, Cytopoint is gradually cleared, and no, it does not act like a traditional vaccine.
Cytopoint is a monoclonal antibody therapy that targets IL-31, the cytokine responsible for itch in allergic dogs. Unlike vaccines, which train the immune system to produce its own antibodies and memory cells, Cytopoint delivers ready-made antibodies. These bind IL-31, block the itch signal, and are eventually broken down naturally like any other protein.
Because the immune system isn’t “trained” by Cytopoint, there is no lasting immune memory. This explains why its effect typically lasts 4–8 weeks before itching returns—not due to resistance, but simply because antibody levels decline over time.
Vaccines build long-term protection by stimulating immunity. Cytopoint provides temporary relief by neutralizing a specific signal. It is therapy, not immunization.
This distinction matters. Some owners expect repeated Cytopoint injections to cure allergies, but its role is maintenance—controlling symptoms safely and effectively, not permanently eliminating them.
When veterinarians explain that Cytopoint is naturally used up and cleared, clients better understand why repeat dosing is needed and why recurrence of itching is not treatment failure.
Dr. Geoff Carullo is a Fellow and the current President of the Philippine College of Canine Practitioners.
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