Diarrhea after Pyrantel in dogs

785 reports to the FDA describe diarrhea in dogs given Pyrantel. That is 16% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

785Reports
30%Marked serious
14%Recovered
22%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
152 37%
1–2 days
106 26%
3–7 days
26 6.4%
1–4 weeks
65 16%
Over a month
58 14%

How the animals did

Recovered
106 14%
Recovered with lasting effects
4 0.5%
Still unwell when reported
135 17%
Died
150 19%
Euthanised
22 2.8%
Not known
368 47%

Problems reported at the same time

Age of the animals

Under 1 year
508
1–3 years
116
4–7 years
56
8–11 years
39
12+ years
23

About this medicine

Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Pyrantel cause diarrhea in dogs?
785 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).

Diarrhea with similar medicines

All reported side effects of Pyrantel in dogs · Medicines most reported with diarrhea