Lymphopenia after Cefovecin (Convenia) in cats

The FDA has received 122 reports of lymphopenia in cats after 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.

122Reports

60%Marked serious

12%Recovered

28%Died or euthanised

3 daysTypical onset

How soon it started

Same day

22 24%

1–2 days

22 24%

3–7 days

12 13%

1–4 weeks

24 27%

Over a month

10 11%

How the animals did

Recovered

15 12%

Still unwell when reported

52 43%

Died

15 12%

Euthanised

19 16%

Not known

21 17%

Problems reported at the same time

76 62%

66 54%

51 42%

41 34%

36 30%

34 28%

34 28%

33 27%

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 lymphopenia in cats?: 122 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).

Lymphopenia with similar medicines

Lymphopenia after Enrofloxacin (Baytril) 28 reports · 1.8% of its reports

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