Allergic reaction after Flumethrin + Imidacloprid (Seresto) in dogs

31 reports to the FDA describe allergic reaction in dogs given Flumethrin + Imidacloprid. That is 1.4% of all reports for this medicine, compared with 2.3% across reports for all dog medicines, so it is reported less often than average with this medicine.

31Reports

35%Marked serious

48%Recovered

0.0%Died or euthanised

Same dayTypical onset

How soon it started

Same day

11 52%

1–2 days

0 0.0%

3–7 days

0 0.0%

1–4 weeks

2 9.5%

Over a month

8 38%

How the animals did

Recovered

15 48%

Still unwell when reported

9 29%

Not known

7 23%

Problems reported at the same time

13 42%

7 23%

7 23%

6 19%

5 16%

Collapse

4 13%

Pale mucous membrane

4 13%

Breathing problems

4 13%

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 allergic reaction in dogs?: 31 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 the same 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).

Allergic reaction with similar medicines

Allergic reaction after Spinosad (Comfortis) 534 reports · 0.9% of its reports
Allergic reaction after Lufenuron + Milbemycin Oxime (Sentinel) 337 reports · 1.3% of its reports
Allergic reaction after Imidacloprid + Moxidectin (Advantage Multi) 267 reports · 2.0% of its reports
Allergic reaction after Nitenpyram (Capstar) 189 reports · 1.8% of its reports
Allergic reaction after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 108 reports · 1.1% of its reports
Allergic reaction after Fipronil + S-methoprene (Frontline Plus) 45 reports · 1.5% of its reports
Allergic reaction after Imidacloprid 28 reports · 1.5% of its reports
Allergic reaction after Fipronil 22 reports · 1.6% of its reports
Allergic reaction after Lufenuron 73 reports · 7.2% of its reports

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