Onsior side effects in cats
174 reports sent to the FDA between 2016 and 2025 involve Onsior in cats. The most reported problems were loss of appetite, lethargy, fever. 72% were marked serious.
174Reports
72%Marked serious
0.0%Only medicine involved
7.5%Recovered
26%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 (167 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Domestic Shorthair 91 reports
- Domestic Longhair 15 reports
- Cat (other) 11 reports
- Domestic Mediumhair 9 reports
- Siamese 3 reports
- Russian 2 reports
- Ragdoll 2 reports
- Manx 2 reports
- Bengal 2 reports
- Himalayan 1 reports
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