Didn't stop worms after Flumethrin + Imidacloprid (Seresto) in cats
The FDA has received 21 reports of didn't stop worms in cats after Flumethrin + Imidacloprid. That is 3.1% of all reports for this medicine, compared with 1.8% across reports for all cat medicines, so it is reported unusually often with this medicine.
21Reports
29%Marked serious
4.8%Recovered
0.0%Died or euthanised
–Typical onset
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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 didn't stop worms 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.
- 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).
Didn't stop worms with similar medicines
- Didn't stop worms after Imidacloprid + Moxidectin (Advantage Multi) 77 reports · 0.9% of its reports
- Didn't stop worms after Imidacloprid + Pyriproxyfen 50 reports · 7.6% of its reports
All reported side effects of Flumethrin + Imidacloprid in cats · Medicines most reported with didn't stop worms