Vocalising after Flumethrin + Imidacloprid (Seresto) in cats

The FDA has received 21 reports of vocalising in cats after Flumethrin + Imidacloprid. That is 3.1% of all reports for this medicine, compared with 3.1% across reports for all cat medicines.

21Reports
71%Marked serious
43%Recovered
14%Died or euthanised
21 daysTypical onset
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How soon it started

Same day
2 13%
1–2 days
0 0.0%
3–7 days
2 13%
1–4 weeks
6 38%
Over a month
6 38%

How the animals did

Recovered
9 43%
Still unwell when reported
1 4.8%
Died
1 4.8%
Euthanised
2 9.5%
Not known
8 38%

Problems reported at the same time

Age of the animals

Under 1 year
3
1–3 years
7
4–7 years
3
8–11 years
2
12+ years
5

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 vocalising in cats?
21 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 21 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).

Vocalising with similar medicines

All reported side effects of Flumethrin + Imidacloprid in cats · Medicines most reported with vocalising