Lethargy after Fipronil in cats
62 reports to the FDA describe lethargy in cats given Fipronil. That is 12% of all reports for this medicine, compared with 14% across reports for all cat medicines.
62Reports
37%Marked serious
48%Recovered
11%Died or euthanised
3 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 cats?
- 62 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 3 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) 1,080 reports · 9.3% of its reports
- Lethargy after Nitenpyram (Capstar) 926 reports · 11% of its reports
- Lethargy after Imidacloprid + Moxidectin (Advantage Multi) 1,394 reports · 17% of its reports
- Lethargy after Lufenuron 236 reports · 21% of its reports
- Lethargy after Flumethrin + Imidacloprid (Seresto) 72 reports · 11% of its reports
- Lethargy after Imidacloprid + Pyriproxyfen 73 reports · 11% of its reports
- Lethargy after Fipronil + S-methoprene (Frontline Plus) 51 reports · 14% of its reports
- Lethargy after Imidacloprid 33 reports · 13% of its reports
All reported side effects of Fipronil in cats · Medicines most reported with lethargy