Nt - abnormal necropsy finding after Spinosad (Comfortis) in cats

The FDA has received 57 reports of nt - abnormal necropsy finding in cats after Spinosad. That is 0.5% of all reports for this medicine, compared with 0.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

57Reports

100%Marked serious

0.0%Recovered

100%Died or euthanised

1 daysTypical onset

How soon it started

Same day

23 44%

1–2 days

11 21%

3–7 days

5 9.6%

1–4 weeks

3 5.8%

Over a month

10 19%

How the animals did

Died

54 95%

Euthanised

3 5.3%

Problems reported at the same time

52 91%

21 37%

18 32%

17 30%

17 30%

14 25%

Cardiomyopathy

12 21%

Pancreas disorder

12 21%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Spinosad kills fleas; monthly chewable.

Products with this ingredient include Comfortis. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Questions owners ask

Can Spinosad cause nt - abnormal necropsy finding in cats?: 57 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 1 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).

All reported side effects of Spinosad in cats · Medicines most reported with nt - abnormal necropsy finding