Lethargy after Aspirin in dogs

The FDA has received 42 reports of lethargy in dogs after Aspirin. That is 24% of all reports for this medicine, compared with 11% across reports for all dog medicines, so it is reported unusually often with this medicine.

42Reports
67%Marked serious
21%Recovered
40%Died or euthanised
36 daysTypical onset
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How soon it started

Same day
7 25%
1–2 days
2 7.1%
3–7 days
2 7.1%
1–4 weeks
3 11%
Over a month
14 50%

How the animals did

Recovered
6 14%
Recovered with lasting effects
3 7.1%
Still unwell when reported
8 19%
Died
7 17%
Euthanised
10 24%
Not known
8 19%

Problems reported at the same time

26 62%
15 36%
Weight loss
9 21%

Age of the animals

Under 1 year
0
1–3 years
5
4–7 years
8
8–11 years
10
12+ years
17

About this medicine

Type: medicine.

Questions owners ask

Can Aspirin cause lethargy in dogs?
42 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 36 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 Aspirin in dogs · Medicines most reported with lethargy