Didn't stop fleas after Pyrantel in dogs

25 reports to the FDA describe didn't stop fleas in dogs given Pyrantel. That is 0.5% of all reports for this medicine, compared with 6.2% across reports for all dog medicines, so it is reported less often than average with this medicine.

25Reports

8.0%Marked serious

8.0%Recovered

0.0%Died or euthanised

303 daysTypical onset

How soon it started

Same day

1 5.3%

1–2 days

0 0.0%

3–7 days

1 5.3%

1–4 weeks

3 16%

Over a month

14 74%

How the animals did

Recovered

2 8.0%

Still unwell when reported

2 8.0%

Not known

21 84%

Problems reported at the same time

Itching

3 12%

Didn't work as expected

2 8.0%

Lethargy

2 8.0%

Drug dose omission

2 8.0%

Didn't prevent heartworm

2 8.0%

Underdose

2 8.0%

Malaise

1 4.0%

Overdose

1 4.0%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Pyrantel cause didn't stop fleas in dogs?: 25 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 303 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 fleas with similar medicines

Didn't stop fleas after Pyrantel + Sarolaner (Simparica Trio) 1,757 reports · 3.3% of its reports
Didn't stop fleas after Fenbendazole 24 reports · 0.4% of its reports
Didn't stop fleas after Praziquantel + Pyrantel 28 reports · 0.8% of its reports

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