Allergic reaction after Cefovecin (Convenia) in cats

The FDA has received 333 reports of allergic reaction in cats after Cefovecin. That is 3.8% 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.

333Reports

55%Marked serious

17%Recovered

32%Died or euthanised

Same dayTypical onset

How soon it started

Same day

174 78%

1–2 days

15 6.7%

3–7 days

10 4.5%

1–4 weeks

10 4.5%

Over a month

15 6.7%

How the animals did

Recovered

55 17%

Recovered with lasting effects

1 0.3%

Still unwell when reported

90 27%

Died

86 26%

Euthanised

19 5.7%

Not known

82 25%

Problems reported at the same time

131 39%

105 32%

89 27%

73 22%

53 16%

49 15%

45 14%

37 11%

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 allergic reaction in cats?: 333 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 the same day 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).

Allergic reaction with similar medicines

Allergic reaction after Amoxicillin + Clavulanate (Clavamox) 39 reports · 1.6% of its reports
Allergic reaction after Enrofloxacin (Baytril) 24 reports · 1.5% of its reports

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