Lethargy after Fish Oil in dogs

The FDA has received 273 reports of lethargy in dogs after Fish Oil. That is 18% of all reports for this medicine, compared with 11% across reports for all dog medicines, so it is reported unusually often with this medicine.

273Reports
51%Marked serious
37%Recovered
18%Died or euthanised
51 daysTypical onset
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How soon it started

Same day
26 14%
1–2 days
18 9.5%
3–7 days
11 5.8%
1–4 weeks
23 12%
Over a month
112 59%

How the animals did

Recovered
88 32%
Recovered with lasting effects
12 4.4%
Still unwell when reported
71 26%
Died
15 5.5%
Euthanised
33 12%
Not known
54 20%

Problems reported at the same time

Age of the animals

Under 1 year
12
1–3 years
42
4–7 years
54
8–11 years
96
12+ years
69

About this medicine

Type: medicine.

Questions owners ask

Can Fish Oil cause lethargy in dogs?
273 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 51 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 Fish Oil in dogs · Medicines most reported with lethargy