Allergy after Spinosad (Comfortis) in dogs

81 reports to the FDA describe allergy in dogs given Spinosad. That is 0.1% of all reports for this medicine, compared with 0.1% across reports for all dog medicines.

81Reports
17%Marked serious
15%Recovered
3.7%Died or euthanised
22 daysTypical onset
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How soon it started

Same day
16 41%
1–2 days
1 2.6%
3–7 days
0 0.0%
1–4 weeks
5 13%
Over a month
17 44%

How the animals did

Recovered
8 9.9%
Recovered with lasting effects
4 4.9%
Still unwell when reported
27 33%
Died
2 2.5%
Euthanised
1 1.2%
Not known
39 48%

Problems reported at the same time

Age of the animals

Under 1 year
5
1–3 years
15
4–7 years
21
8–11 years
27
12+ years
8

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 allergy in dogs?
81 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 22 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).

Allergy with similar medicines

All reported side effects of Spinosad in dogs · Medicines most reported with allergy