Didn't stop worms after Pyrantel in dogs

808 reports to the FDA describe didn't stop worms in dogs given Pyrantel. That is 17% 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.

808Reports
28%Marked serious
5.4%Recovered
8.0%Died or euthanised
42 daysTypical onset
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How soon it started

Same day
21 4.4%
1–2 days
12 2.5%
3–7 days
17 3.6%
1–4 weeks
126 27%
Over a month
299 63%

How the animals did

Recovered
40 5.0%
Recovered with lasting effects
4 0.5%
Still unwell when reported
230 28%
Died
64 7.9%
Euthanised
1 0.1%
Not known
469 58%

Problems reported at the same time

Didn't work as expected
117 14%
Diarrhea
62 7.7%
Death
60 7.4%
Vomiting
38 4.7%
Loss of appetite
37 4.6%
Lethargy
24 3.0%
Blood problems
19 2.4%
Loose stool
18 2.2%

Age of the animals

Under 1 year
383
1–3 years
152
4–7 years
85
8–11 years
35
12+ years
18

About this medicine

Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Pyrantel cause didn't stop worms in dogs?
808 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 42 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).

Didn't stop worms with similar medicines

All reported side effects of Pyrantel in dogs · Medicines most reported with didn't stop worms