Didn't work as expected after Pyrantel in dogs

426 reports to the FDA describe didn't work as expected in dogs given Pyrantel. That is 8.9% of all reports for this medicine, compared with 13% across reports for all dog medicines.

426Reports
32%Marked serious
8.5%Recovered
9.9%Died or euthanised
30 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
18 8.9%
1–2 days
14 6.9%
3–7 days
12 5.9%
1–4 weeks
59 29%
Over a month
100 49%

How the animals did

Recovered
33 7.7%
Recovered with lasting effects
3 0.7%
Still unwell when reported
77 18%
Died
36 8.5%
Euthanised
6 1.4%
Not known
271 64%

Problems reported at the same time

Didn't stop worms
117 27%
Diarrhea
55 13%
Vomiting
55 13%
Death
42 9.9%
Loss of appetite
36 8.5%
Lethargy
28 6.6%
Weight loss
15 3.5%
Liver problems
14 3.3%

Age of the animals

Under 1 year
214
1–3 years
77
4–7 years
35
8–11 years
23
12+ years
15

About this medicine

Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Pyrantel cause didn't work as expected in dogs?
426 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 30 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 work as expected with similar medicines

All reported side effects of Pyrantel in dogs · Medicines most reported with didn't work as expected