Didn't prevent heartworm after Imidacloprid + Permethrin in dogs

20 reports to the FDA describe didn't prevent heartworm in dogs given Imidacloprid + Permethrin. That is 4.3% of all reports for this medicine, compared with 13% 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 prevent heartworm 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 prevent heartworm with similar medicines

• Didn't prevent heartworm after Spinosad (Comfortis) 99 reports · 0.2% of its reports
• Didn't prevent heartworm after Lufenuron + Milbemycin Oxime (Sentinel) 7,458 reports · 29% of its reports
• Didn't prevent heartworm after Imidacloprid + Moxidectin (Advantage Multi) 1,665 reports · 13% of its reports
• Didn't prevent heartworm after Nitenpyram (Capstar) 30 reports · 0.3% of its reports
• Didn't prevent heartworm after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 2,544 reports · 26% of its reports
• Didn't prevent heartworm after Fipronil + S-methoprene (Frontline Plus) 31 reports · 1.0% of its reports
• Didn't prevent heartworm after Flumethrin + Imidacloprid (Seresto) 62 reports · 2.7% of its reports
• Didn't prevent heartworm after Fipronil 30 reports · 2.1% of its reports

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