Seizures after Feline Core Vaccine in cats

55 reports to the FDA describe seizures in cats given Feline Core Vaccine. That is 3.5% of all reports for this medicine, compared with 2.6% across reports for all cat medicines.

55Reports

93%Marked serious

20%Recovered

45%Died or euthanised

1 daysTypical onset

How soon it started

Same day

24 45%

1–2 days

16 30%

3–7 days

4 7.5%

1–4 weeks

5 9.4%

Over a month

4 7.5%

How the animals did

Recovered

11 20%

Still unwell when reported

13 24%

Died

13 24%

Euthanised

12 22%

Not known

6 11%

Problems reported at the same time

24 44%

19 35%

12 22%

11 20%

11 20%

9 16%

9 16%

8 15%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: vaccine.

Mild, short-lived lethargy, soreness or a small lump at the injection site are the most commonly reported vaccine reactions.

Questions owners ask

Can Feline Core Vaccine cause seizures in cats?: 55 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?: In half of the reports with dates, it started within 1 day of the first dose.
What should I do?: Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Seizures with similar medicines

Seizures after Rabies Vaccine 92 reports · 3.6% of its reports

All reported side effects of Feline Core Vaccine in cats · Medicines most reported with seizures