Dehydration after Feline Leukemia Vaccine in cats

The FDA has received 41 reports of dehydration in cats after Feline Leukemia Vaccine. That is 5.1% of all reports for this medicine, compared with 2.0% across reports for all cat medicines, so it is reported unusually often with this medicine.

41Reports

73%Marked serious

29%Recovered

29%Died or euthanised

1 daysTypical onset

How soon it started

Same day

11 29%

1–2 days

16 42%

3–7 days

7 18%

1–4 weeks

3 7.9%

Over a month

1 2.6%

How the animals did

Recovered

12 29%

Still unwell when reported

12 29%

Died

1 2.4%

Euthanised

11 27%

Not known

5 12%

Problems reported at the same time

37 90%

26 63%

17 41%

15 37%

15 37%

12 29%

12 29%

10 24%

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 dehydration in cats?: 41 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).

Dehydration with similar medicines

Dehydration after Rabies Vaccine 137 reports · 5.3% of its reports
Dehydration after Feline Core Vaccine 114 reports · 7.3% of its reports

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