Loss of appetite after Flumethrin + Imidacloprid (Seresto) in dogs

The FDA has received 172 reports of loss of appetite in dogs after Flumethrin + Imidacloprid. That is 7.6% of all reports for this medicine, compared with 8.4% across reports for all dog medicines.

172Reports
52%Marked serious
30%Recovered
10%Died or euthanised
16 daysTypical onset
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How soon it started

Same day
12 9.5%
1–2 days
19 15%
3–7 days
19 15%
1–4 weeks
29 23%
Over a month
47 37%

How the animals did

Recovered
51 30%
Recovered with lasting effects
1 0.6%
Still unwell when reported
37 22%
Died
10 5.8%
Euthanised
8 4.7%
Not known
65 38%

Problems reported at the same time

Age of the animals

Under 1 year
15
1–3 years
34
4–7 years
62
8–11 years
40
12+ years
18

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 loss of appetite in dogs?
172 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).

Loss of appetite with similar medicines

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