Leucopenia after Cefovecin (Convenia) in cats

125 reports to the FDA describe leucopenia in cats given Cefovecin. That is 1.4% of all reports for this medicine, compared with 0.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

125Reports

54%Marked serious

8.0%Recovered

37%Died or euthanised

6 daysTypical onset

How soon it started

Same day

17 19%

1–2 days

20 22%

3–7 days

13 14%

1–4 weeks

29 32%

Over a month

12 13%

How the animals did

Recovered

10 8.0%

Still unwell when reported

48 38%

Died

28 22%

Euthanised

18 14%

Not known

21 17%

Problems reported at the same time

70 56%

70 56%

66 53%

45 36%

41 33%

40 32%

32 26%

30 24%

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 leucopenia in cats?: 125 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 6 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).

Leucopenia with similar medicines

Leucopenia after Amoxicillin + Clavulanate (Clavamox) 26 reports · 1.1% of its reports
Leucopenia after Enrofloxacin (Baytril) 26 reports · 1.6% of its reports

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