Lethargy after Fenbendazole in dogs
The FDA has received 1,078 reports of lethargy in dogs after Fenbendazole. That is 18% of all reports for this medicine, compared with 11% across reports for all dog medicines, so it is reported unusually often with this medicine.
1,078Reports
33%Marked serious
16%Recovered
16%Died or euthanised
1 daysTypical onset
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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
Fenbendazole treats intestinal worms and some other parasites.
Questions owners ask
- Can Fenbendazole cause lethargy in dogs?
- 1,078 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 1 day 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 Pyrantel + Sarolaner (Simparica Trio) 3,702 reports · 6.9% of its reports
- Lethargy after Febantel + Praziquantel + Pyrantel (Drontal Plus) 651 reports · 9.7% of its reports
- Lethargy after Pyrantel 928 reports · 19% of its reports
- Lethargy after Praziquantel + Pyrantel 956 reports · 26% of its reports
- Lethargy after Praziquantel 148 reports · 13% of its reports
All reported side effects of Fenbendazole in dogs · Medicines most reported with lethargy