Diphenhydramine side effects in cats
368 reports sent to the FDA between 1999 and 2026 involve Diphenhydramine in cats. The most reported problems were vomiting, loss of appetite, lethargy. 67% were marked serious, and where it was recorded, signs eased after stopping the medicine in 0% of cases.
368Reports
67%Marked serious
1.4%Only medicine involved
29%Recovered
23%Died or euthanised
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About this medicine
Type: medicine.
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 (335 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Domestic Shorthair 251 reports
- Domestic Longhair 34 reports
- Domestic Mediumhair 18 reports
- Maine Coon 5 reports
- Domestic 4 reports
- Siamese 4 reports
- Ragdoll 4 reports
- Persian 3 reports
- Bengal 3 reports
- Cat (other) 3 reports
Other medicines for cats
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