Fenbendazole side effects in cats
285 reports sent to the FDA between 1995 and 2026 involve Fenbendazole in cats. The most reported problems were vomiting, lethargy, loss of appetite. 49% were marked serious.
285Reports
49%Marked serious
43%Only medicine involved
26%Recovered
21%Died or euthanised
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About this medicine
Fenbendazole treats intestinal worms and some other parasites.
Most reported side effects
Share = percentage of this medicine's reports that mention the problem. One report can list several problems.
Reports that it didn't work
Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.
How soon problems started
Time from the first dose to the first sign, where both dates were reported (197 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Domestic Shorthair 161 reports
- Domestic 31 reports
- Domestic Mediumhair 15 reports
- Domestic Longhair 13 reports
- Siberian 7 reports
- American Shorthair 4 reports
- Maine Coon 4 reports
- Persian 4 reports
- Cat (other) 3 reports
- Siamese 2 reports
Other dewormers for cats
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