Lethargy after Flunixin Meglumine in horses

The FDA has received 60 reports of lethargy in horses after Flunixin Meglumine. That is 9.6% of all reports for this medicine, compared with 7.9% across reports for all horse medicines.

60Reports
58%Marked serious
20%Recovered
27%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
6 18%
1–2 days
20 59%
3–7 days
5 15%
1–4 weeks
3 8.8%
Over a month
0 0.0%

How the animals did

Recovered
10 17%
Recovered with lasting effects
2 3.3%
Still unwell when reported
14 23%
Died
12 20%
Euthanised
4 6.7%
Not known
18 30%

Problems reported at the same time

Age of the animals

Under 1 year
3
1–3 years
7
4–7 years
11
8–11 years
13
12+ years
19

About this medicine

Type: medicine.

Questions owners ask

Can Flunixin Meglumine cause lethargy in horses?
60 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 1 day 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 Flunixin Meglumine in horses · Medicines most reported with lethargy