Abnormal cytology after Cefovecin (Convenia) in cats

The FDA has received 102 reports of abnormal cytology in cats after Cefovecin. That is 1.2% of all reports for this medicine, compared with 0.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

102Reports

74%Marked serious

14%Recovered

5.9%Died or euthanised

15 daysTypical onset

How soon it started

Same day

6 6.5%

1–2 days

12 13%

3–7 days

12 13%

1–4 weeks

37 40%

Over a month

25 27%

How the animals did

Recovered

14 14%

Still unwell when reported

67 66%

Died

2 2.0%

Euthanised

4 3.9%

Not known

15 15%

Problems reported at the same time

Didn't work as expected

31 30%

Skin rash or irritation

31 30%

Injection site reaction

29 28%

24 24%

22 22%

19 19%

19 19%

16 16%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Cefovecin a long-acting antibiotic injection.

Products with this ingredient include Convenia. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Questions owners ask

Can Cefovecin cause abnormal cytology in cats?: 102 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 15 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).

All reported side effects of Cefovecin in cats · Medicines most reported with abnormal cytology