Constipation after Feline Core Vaccine in cats

The FDA has received 23 reports of constipation in cats after Feline Core Vaccine. That is 1.5% of all reports for this medicine, compared with 0.6% across reports for all cat medicines, so it is reported unusually often with this medicine.

23Reports

78%Marked serious

26%Recovered

22%Died or euthanised

10 daysTypical onset

How soon it started

Same day

1 4.3%

1–2 days

2 8.7%

3–7 days

3 13%

1–4 weeks

15 65%

Over a month

2 8.7%

How the animals did

Recovered

6 26%

Still unwell when reported

11 48%

Died

3 13%

Euthanised

2 8.7%

Not known

1 4.3%

Problems reported at the same time

20 87%

17 74%

12 52%

6 26%

Abnormal radiograph finding

5 22%

Vomiting

5 22%

Death

5 22%

Wobbliness (ataxia)

4 17%

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 constipation in cats?: 23 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 10 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).

Constipation with similar medicines

Constipation after Rabies Vaccine 34 reports · 1.3% of its reports

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