Weight loss after Flumethrin + Imidacloprid (Seresto) in dogs

57 reports to the FDA describe weight loss in dogs given Flumethrin + Imidacloprid. That is 2.5% of all reports for this medicine, compared with 1.7% across reports for all dog medicines.

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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 weight loss in dogs?

57 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 70 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).

Weight loss with similar medicines

• Weight loss after Spinosad (Comfortis) 531 reports · 0.9% of its reports
• Weight loss after Lufenuron + Milbemycin Oxime (Sentinel) 280 reports · 1.1% of its reports
• Weight loss after Imidacloprid + Moxidectin (Advantage Multi) 236 reports · 1.8% of its reports
• Weight loss after Nitenpyram (Capstar) 89 reports · 0.8% of its reports
• Weight loss after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 77 reports · 0.8% of its reports
• Weight loss after Fipronil + S-methoprene (Frontline Plus) 29 reports · 1.0% of its reports
• Weight loss after Fipronil 28 reports · 2.0% of its reports

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