Hair loss after Fipronil in dogs

The FDA has received 22 reports of hair loss in dogs after Fipronil. That is 1.6% of all reports for this medicine, compared with 1.0% across reports for all dog 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

Fipronil kills fleas and ticks (spot-on).

Questions owners ask

Can Fipronil cause hair loss in dogs?

22 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 28 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) 503 reports · 0.9% of its reports
• Hair loss after Lufenuron + Milbemycin Oxime (Sentinel) 227 reports · 0.9% of its reports
• Hair loss after Imidacloprid + Moxidectin (Advantage Multi) 452 reports · 3.4% of its reports
• Hair loss after Nitenpyram (Capstar) 195 reports · 1.8% of its reports
• Hair loss after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 46 reports · 0.5% of its reports
• Hair loss after Fipronil + S-methoprene (Frontline Plus) 113 reports · 3.8% of its reports
• Hair loss after Flumethrin + Imidacloprid (Seresto) 135 reports · 5.9% of its reports
• Hair loss after Imidacloprid 43 reports · 2.3% of its reports
• Hair loss after Lufenuron 45 reports · 4.4% of its reports
• Hair loss after Imidacloprid + Permethrin + Pyriproxyfen 33 reports · 4.5% of its reports

All reported side effects of Fipronil in dogs · Medicines most reported with hair loss