Didn't stop worms after Imidacloprid + Permethrin in dogs

The FDA has received 20 reports of didn't stop worms in dogs after Imidacloprid + Permethrin. That is 4.3% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

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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).

Questions owners ask

Can Imidacloprid + Permethrin cause didn't stop worms in dogs?

20 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 Spinosad (Comfortis) 60 reports · 0.1% of its reports
• Didn't stop worms after Lufenuron + Milbemycin Oxime (Sentinel) 4,911 reports · 19% of its reports
• Didn't stop worms after Imidacloprid + Moxidectin (Advantage Multi) 821 reports · 6.3% of its reports
• Didn't stop worms after Nitenpyram (Capstar) 28 reports · 0.3% of its reports
• Didn't stop worms after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 2,556 reports · 26% of its reports
• Didn't stop worms after Fipronil + S-methoprene (Frontline Plus) 57 reports · 1.9% of its reports
• Didn't stop worms after Flumethrin + Imidacloprid (Seresto) 80 reports · 3.5% of its reports
• Didn't stop worms after Fipronil 52 reports · 3.7% of its reports
• Didn't stop worms after Imidacloprid + Permethrin + Pyriproxyfen 30 reports · 4.1% of its reports

All reported side effects of Imidacloprid + Permethrin in dogs · Medicines most reported with didn't stop worms