Vomiting after Vitamin B12 in cats

The FDA has received 82 reports of vomiting in cats after Vitamin B12. That is 21% of all reports for this medicine, compared with 18% across reports for all cat medicines.

82Reports
67%Marked serious
23%Recovered
28%Died or euthanised
6 daysTypical onset
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How soon it started

Same day
16 23%
1–2 days
11 15%
3–7 days
10 14%
1–4 weeks
18 25%
Over a month
16 23%

How the animals did

Recovered
19 23%
Still unwell when reported
25 30%
Died
6 7.3%
Euthanised
17 21%
Not known
15 18%

Problems reported at the same time

Age of the animals

Under 1 year
5
1–3 years
3
4–7 years
10
8–11 years
17
12+ years
45

About this medicine

Type: medicine.

Questions owners ask

Can Vitamin B12 cause vomiting in cats?
82 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 6 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).

Vomiting with similar medicines

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