Neutropenia after Cefovecin (Convenia) in cats

The FDA has received 104 reports of neutropenia in cats after Cefovecin. That is 1.2% of all reports for this medicine, compared with 0.3% across reports for all cat medicines, so it is reported unusually often with this medicine.

104Reports

56%Marked serious

3.8%Recovered

33%Died or euthanised

10 daysTypical onset

How soon it started

Same day

13 17%

1–2 days

14 18%

3–7 days

11 14%

1–4 weeks

20 26%

Over a month

19 25%

How the animals did

Recovered

4 3.8%

Still unwell when reported

47 45%

Died

16 15%

Euthanised

18 17%

Not known

19 18%

Problems reported at the same time

51 49%

45 43%

43 41%

41 39%

34 33%

31 30%

31 30%

26 25%

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 neutropenia in cats?: 104 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).

Neutropenia with similar medicines

Neutropenia after Enrofloxacin (Baytril) 24 reports · 1.5% of its reports

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