Vomiting after Flumethrin + Imidacloprid (Seresto) in dogs

The FDA has received 295 reports of vomiting in dogs after Flumethrin + Imidacloprid. That is 13% of all reports for this medicine, compared with 28% across reports for all dog medicines, so it is reported less often than average with this medicine.

295Reports

37%Marked serious

43%Recovered

7.1%Died or euthanised

16 daysTypical onset

How soon it started

Same day

38 18%

1–2 days

28 13%

3–7 days

18 8.4%

1–4 weeks

46 21%

Over a month

85 40%

How the animals did

Recovered

122 41%

Recovered with lasting effects

4 1.4%

Still unwell when reported

59 20%

Died

11 3.7%

Euthanised

10 3.4%

Not known

89 30%

Problems reported at the same time

88 30%

71 24%

67 23%

44 15%

34 12%

26 8.8%

26 8.8%

22 7.5%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Imidacloprid kills fleas (spot-on or collar).

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

Questions owners ask

Can Flumethrin + Imidacloprid cause vomiting in dogs?: 295 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 16 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).

Vomiting with similar medicines

Vomiting after Spinosad (Comfortis) 30,909 reports · 54% of its reports
Vomiting after Lufenuron + Milbemycin Oxime (Sentinel) 4,725 reports · 18% of its reports
Vomiting after Imidacloprid + Moxidectin (Advantage Multi) 1,904 reports · 15% of its reports
Vomiting after Nitenpyram (Capstar) 1,204 reports · 11% of its reports
Vomiting after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 1,925 reports · 19% of its reports
Vomiting after Fipronil + S-methoprene (Frontline Plus) 627 reports · 21% of its reports
Vomiting after Imidacloprid 251 reports · 13% of its reports
Vomiting after Fipronil 417 reports · 30% of its reports
Vomiting after Lufenuron 325 reports · 32% of its reports
Vomiting after Imidacloprid + Permethrin + Pyriproxyfen 116 reports · 16% of its reports

All reported side effects of Flumethrin + Imidacloprid in dogs · Medicines most reported with vomiting