Swelling after Phenylbutazone in horses

35 reports to the FDA describe swelling in horses given Phenylbutazone. That is 23% of all reports for this medicine, compared with 19% across reports for all horse medicines.

35Reports
57%Marked serious
26%Recovered
29%Died or euthanised
6 daysTypical onset
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How soon it started

Same day
4 16%
1–2 days
3 12%
3–7 days
8 32%
1–4 weeks
9 36%
Over a month
1 4.0%

How the animals did

Recovered
8 23%
Recovered with lasting effects
1 2.9%
Still unwell when reported
9 26%
Died
7 20%
Euthanised
3 8.6%
Not known
7 20%

Problems reported at the same time

8 23%
Fever
8 23%
Injection site reaction
8 23%
Lameness
6 17%
Allergic reaction
4 11%
Colic
4 11%
Localised pain (see other 'socs' for specific pain)
3 8.6%
Tremors
3 8.6%

Age of the animals

Under 1 year
0
1–3 years
2
4–7 years
12
8–11 years
3
12+ years
16

About this medicine

Type: medicine.

Questions owners ask

Can Phenylbutazone cause swelling in horses?
35 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 6 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).

Swelling with similar medicines

All reported side effects of Phenylbutazone in horses · Medicines most reported with swelling