Leucocytosis after Cefovecin (Convenia) in cats

281 reports to the FDA describe leucocytosis in cats given Cefovecin. That is 3.2% of all reports for this medicine, compared with 0.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

281Reports

55%Marked serious

5.0%Recovered

38%Died or euthanised

2 daysTypical onset

How soon it started

Same day

50 25%

1–2 days

54 26%

3–7 days

39 19%

1–4 weeks

37 18%

Over a month

24 12%

How the animals did

Recovered

11 3.9%

Recovered with lasting effects

3 1.1%

Still unwell when reported

102 36%

Died

57 20%

Euthanised

50 18%

Not known

58 21%

Problems reported at the same time

142 51%

141 50%

105 37%

105 37%

95 34%

90 32%

84 30%

76 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 leucocytosis in cats?: 281 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 2 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).

Leucocytosis with similar medicines

Leucocytosis after Amoxicillin + Clavulanate (Clavamox) 61 reports · 2.6% of its reports
Leucocytosis after Enrofloxacin (Baytril) 33 reports · 2.1% of its reports

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