Hair loss after Flumethrin + Imidacloprid (Seresto) in cats

166 reports to the FDA describe hair loss in cats given Flumethrin + Imidacloprid. That is 25% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

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How soon it started

How the animals did

Problems reported at the same time

Age of the animals

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 hair loss in cats?

166 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).

Hair loss with similar medicines

• Hair loss after Spinosad (Comfortis) 76 reports · 0.7% of its reports
• Hair loss after Nitenpyram (Capstar) 111 reports · 1.3% of its reports
• Hair loss after Imidacloprid + Moxidectin (Advantage Multi) 1,437 reports · 18% of its reports
• Hair loss after Lufenuron 83 reports · 7.5% of its reports
• Hair loss after Imidacloprid + Pyriproxyfen 83 reports · 13% of its reports
• Hair loss after Fipronil 34 reports · 6.8% of its reports
• Hair loss after Fipronil + S-methoprene (Frontline Plus) 39 reports · 11% of its reports
• Hair loss after Imidacloprid 24 reports · 9.5% of its reports

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