Seizures after Flumethrin + Imidacloprid (Seresto) in dogs

123 reports to the FDA describe seizures in dogs given Flumethrin + Imidacloprid. That is 5.4% of all reports for this medicine, compared with 4.4% across reports for all dog medicines.

123Reports

90%Marked serious

33%Recovered

11%Died or euthanised

18 daysTypical onset

How soon it started

Same day

14 17%

1–2 days

11 13%

3–7 days

6 7.2%

1–4 weeks

20 24%

Over a month

32 39%

How the animals did

Recovered

41 33%

Still unwell when reported

28 23%

Died

5 4.1%

Euthanised

9 7.3%

Not known

40 33%

Problems reported at the same time

22 18%

19 15%

16 13%

14 11%

13 11%

13 11%

12 9.8%

11 8.9%

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 seizures in dogs?: 123 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 18 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).

Seizures with similar medicines

Seizures after Spinosad (Comfortis) 2,116 reports · 3.7% of its reports
Seizures after Lufenuron + Milbemycin Oxime (Sentinel) 937 reports · 3.6% of its reports
Seizures after Imidacloprid + Moxidectin (Advantage Multi) 520 reports · 4.0% of its reports
Seizures after Nitenpyram (Capstar) 331 reports · 3.1% of its reports
Seizures after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 279 reports · 2.8% of its reports
Seizures after Fipronil + S-methoprene (Frontline Plus) 214 reports · 7.2% of its reports
Seizures after Imidacloprid 43 reports · 2.3% of its reports
Seizures after Fipronil 72 reports · 5.1% of its reports
Seizures after Lufenuron 65 reports · 6.4% of its reports
Seizures after Imidacloprid + Permethrin + Pyriproxyfen 34 reports · 4.6% of its reports

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