Vitamin B12 side effects in cats
386 reports sent to the FDA between 2000 and 2026 involve Vitamin B12 in cats. The most reported problems were loss of appetite, lethargy, vomiting. 55% were marked serious.
386Reports
55%Marked serious
0.3%Only medicine involved
16%Recovered
21%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 (339 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Domestic Shorthair 217 reports
- Domestic Mediumhair 36 reports
- Domestic Longhair 32 reports
- Cat (other) 14 reports
- Siamese 11 reports
- Persian 8 reports
- Ragdoll 7 reports
- Maine Coon 4 reports
- Bengal 4 reports
- Domestic 3 reports
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