Pyrantel side effects in horses

938 reports sent to the FDA between 1996 and 2026 involve Pyrantel in horses. The most reported problems were accidental exposure, abdominal pain, no sign. 3.3% were marked serious, and where it was recorded, signs eased after stopping the medicine in 33% of cases.

938Reports
3.3%Marked serious
97%Only medicine involved
4.5%Recovered
7.6%Died or euthanised
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About this medicine

Pyrantel treats roundworms and hookworms.

Most reported side effects

135 14%
56 6.0%
54 5.8%
27 2.9%
26 2.8%
Itching
18 1.9%
Liver problems
18 1.9%
Restlessness or agitation
17 1.8%

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a horse still getting fleas or heartworm), not about a side effect.

How soon problems started

Same day
24 32%
1–2 days
15 20%
3–7 days
2 2.7%
1–4 weeks
6 8.1%
Over a month
27 36%

Time from the first dose to the first sign, where both dates were reported (74 reports).

How the animals did

Recovered
42 4.5%
Still unwell when reported
15 1.6%
Died
66 7.0%
Euthanised
5 0.5%
Not known
810 86%

Breeds named most often

Popular breeds appear more often because there are more of them.

Other dewormers for horses