Death after Vitamin B12 in cats

77 reports to the FDA describe death in cats given Vitamin B12. That is 20% of all reports for this medicine, compared with 8.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

77Reports
97%Marked serious
0.0%Recovered
100%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
22 33%
1–2 days
16 24%
3–7 days
7 10%
1–4 weeks
12 18%
Over a month
10 15%

How the animals did

Died
30 39%
Euthanised
47 61%

Problems reported at the same time

Age of the animals

Under 1 year
4
1–3 years
2
4–7 years
8
8–11 years
15
12+ years
47

About this medicine

Type: medicine.

Questions owners ask

Can Vitamin B12 cause death in cats?
77 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 2 days 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).

Death with similar medicines

All reported side effects of Vitamin B12 in cats · Medicines most reported with death