Abdominal pain after Spinosad (Comfortis) in dogs

166 reports to the FDA describe abdominal pain in dogs given Spinosad. That is 0.3% of all reports for this medicine, compared with 0.4% across reports for all dog medicines.

166Reports

21%Marked serious

18%Recovered

19%Died or euthanised

1 daysTypical onset

How soon it started

Same day

19 37%

1–2 days

9 18%

3–7 days

2 3.9%

1–4 weeks

6 12%

Over a month

15 29%

How the animals did

Recovered

24 14%

Recovered with lasting effects

6 3.6%

Still unwell when reported

8 4.8%

Died

26 16%

Euthanised

6 3.6%

Not known

96 58%

Problems reported at the same time

94 57%

92 55%

81 49%

41 25%

36 22%

34 20%

33 20%

25 15%

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 abdominal pain in dogs?: 166 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).

Abdominal pain with similar medicines

Abdominal pain after Lufenuron + Milbemycin Oxime (Sentinel) 74 reports · 0.3% of its reports
Abdominal pain after Imidacloprid + Moxidectin (Advantage Multi) 24 reports · 0.2% of its reports

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