Death after Monensin Sodium in horses

The FDA has received 92 reports of death in horses after Monensin Sodium. That is 77% of all reports for this medicine, compared with 11% across reports for all horse medicines, so it is reported unusually often with this medicine.

92Reports
100%Marked serious
0.0%Recovered
100%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
48 55%
1–2 days
16 18%
3–7 days
7 8.0%
1–4 weeks
11 13%
Over a month
6 6.8%

How the animals did

Died
87 95%
Euthanised
5 5.4%

Problems reported at the same time

17 18%
Accidental exposure
14 15%
Recumbency
9 9.8%
Loss of appetite
8 8.7%
Malaise
8 8.7%
Behaviour change
5 5.4%
Neurological signs
5 5.4%
Wobbliness (ataxia)
4 4.3%

Age of the animals

Under 1 year
1
1–3 years
3
4–7 years
6
8–11 years
4
12+ years
5

About this medicine

Type: medicine.

Questions owners ask

Can Monensin Sodium cause death in horses?
92 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 the same 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).

Death with similar medicines

All reported side effects of Monensin Sodium in horses · Medicines most reported with death