Lethargy after Vitamin K in dogs

67 reports to the FDA describe lethargy in dogs given Vitamin K. That is 50% of all reports for this medicine, compared with 11% across reports for all dog medicines, so it is reported unusually often with this medicine.

67Reports
91%Marked serious
7.5%Recovered
66%Died or euthanised
9 daysTypical onset
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How soon it started

Same day
10 16%
1–2 days
6 9.8%
3–7 days
12 20%
1–4 weeks
21 34%
Over a month
12 20%

How the animals did

Recovered
5 7.5%
Still unwell when reported
18 27%
Died
13 19%
Euthanised
31 46%

Problems reported at the same time

Age of the animals

Under 1 year
4
1–3 years
13
4–7 years
24
8–11 years
20
12+ years
4

About this medicine

Type: medicine.

Questions owners ask

Can Vitamin K cause lethargy in dogs?
67 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 9 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).

Lethargy with similar medicines

All reported side effects of Vitamin K in dogs · Medicines most reported with lethargy