Liver problems after Feline Leukemia Vaccine in cats

43 reports to the FDA describe liver problems in cats given Feline Leukemia Vaccine. That is 5.4% of all reports for this medicine, compared with 2.8% across reports for all cat medicines, so it is reported unusually often with this medicine.

43Reports

81%Marked serious

28%Recovered

35%Died or euthanised

1 daysTypical onset

How soon it started

Same day

18 46%

1–2 days

8 21%

3–7 days

5 13%

1–4 weeks

2 5.1%

Over a month

6 15%

How the animals did

Recovered

12 28%

Still unwell when reported

11 26%

Died

5 12%

Euthanised

10 23%

Not known

5 12%

Problems reported at the same time

27 63%

23 53%

19 44%

14 33%

14 33%

12 28%

12 28%

11 26%

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 Leukemia Vaccine cause liver problems in cats?: 43 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).

Liver problems with similar medicines

Liver problems after Rabies Vaccine 168 reports · 6.5% of its reports
Liver problems after Feline Core Vaccine 95 reports · 6.1% of its reports

All reported side effects of Feline Leukemia Vaccine in cats · Medicines most reported with liver problems