Lethargy after Fipronil in dogs
The FDA has received 185 reports of lethargy in dogs after Fipronil. That is 13% of all reports for this medicine, compared with 11% across reports for all dog medicines.
185Reports
42%Marked serious
50%Recovered
9.2%Died or euthanised
31 daysTypical onset
Sponsored
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 lethargy in dogs?
- 185 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 31 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).
Lethargy with similar medicines
- Lethargy after Spinosad (Comfortis) 7,303 reports · 13% of its reports
- Lethargy after Lufenuron + Milbemycin Oxime (Sentinel) 2,341 reports · 9.0% of its reports
- Lethargy after Imidacloprid + Moxidectin (Advantage Multi) 2,000 reports · 15% of its reports
- Lethargy after Nitenpyram (Capstar) 1,204 reports · 11% of its reports
- Lethargy after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 666 reports · 6.7% of its reports
- Lethargy after Fipronil + S-methoprene (Frontline Plus) 447 reports · 15% of its reports
- Lethargy after Flumethrin + Imidacloprid (Seresto) 250 reports · 11% of its reports
- Lethargy after Imidacloprid 196 reports · 10% of its reports
- Lethargy after Lufenuron 205 reports · 20% of its reports
- Lethargy after Imidacloprid + Permethrin + Pyriproxyfen 106 reports · 14% of its reports
All reported side effects of Fipronil in dogs · Medicines most reported with lethargy