Loss of appetite after Feline Core Vaccine in cats

The FDA has received 661 reports of loss of appetite in cats after Feline Core Vaccine. That is 43% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

661Reports
54%Marked serious
32%Recovered
16%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
158 25%
1–2 days
155 25%
3–7 days
101 16%
1–4 weeks
179 29%
Over a month
35 5.6%

How the animals did

Recovered
213 32%
Recovered with lasting effects
1 0.2%
Still unwell when reported
265 40%
Died
48 7.3%
Euthanised
55 8.3%
Not known
79 12%

Problems reported at the same time

Age of the animals

Under 1 year
170
1–3 years
155
4–7 years
153
8–11 years
118
12+ years
56

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 loss of appetite in cats?
661 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 3 days 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).

Loss of appetite with similar medicines

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