Swelling after Cefovecin (Convenia) in cats

The FDA has received 456 reports of swelling in cats after Cefovecin. That is 5.3% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

456Reports

47%Marked serious

10%Recovered

36%Died or euthanised

2 daysTypical onset

How soon it started

Same day

97 31%

1–2 days

68 22%

3–7 days

68 22%

1–4 weeks

54 17%

Over a month

23 7.4%

How the animals did

Recovered

46 10%

Recovered with lasting effects

1 0.2%

Still unwell when reported

141 31%

Died

108 24%

Euthanised

55 12%

Not known

105 23%

Problems reported at the same time

161 35%

147 32%

123 27%

109 24%

89 20%

Abnormal radiograph finding

79 17%

Vomiting

60 13%

Blood problems

55 12%

Age of the animals

Under 1 year

1–3 years

4–7 years

110

8–11 years

110

12+ years

105

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 swelling in cats?: 456 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).

Swelling with similar medicines

Swelling after Amoxicillin + Clavulanate (Clavamox) 86 reports · 3.6% of its reports
Swelling after Enrofloxacin (Baytril) 58 reports · 3.7% of its reports

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