Falling after Spinosad (Comfortis) in dogs

109 reports to the FDA describe falling in dogs given Spinosad. That is 0.2% of all reports for this medicine, compared with 0.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

109Reports
60%Marked serious
57%Recovered
17%Died or euthanised
5 daysTypical onset
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How soon it started

Same day
28 35%
1–2 days
11 14%
3–7 days
2 2.5%
1–4 weeks
10 12%
Over a month
30 37%

How the animals did

Recovered
41 38%
Recovered with lasting effects
21 19%
Still unwell when reported
6 5.5%
Died
11 10%
Euthanised
8 7.3%
Not known
22 20%

Problems reported at the same time

Age of the animals

Under 1 year
11
1–3 years
21
4–7 years
21
8–11 years
26
12+ years
26

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 falling in dogs?
109 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 5 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).

Falling with similar medicines

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