Didn't work as expected after Pyrantel in cats

37 reports to the FDA describe didn't work as expected in cats given Pyrantel. That is 6.6% of all reports for this medicine, compared with 8.7% across reports for all cat medicines.

37Reports

11%Marked serious

0.0%Recovered

11%Died or euthanised

29 daysTypical onset

How soon it started

Same day

3 23%

1–2 days

0 0.0%

3–7 days

1 7.7%

1–4 weeks

4 31%

Over a month

5 38%

How the animals did

Still unwell when reported

12 32%

Died

4 11%

Not known

21 57%

Problems reported at the same time

Lethargy

6 16%

Drug administration error

6 16%

5 14%

4 11%

4 11%

4 11%

3 8.1%

Liver problems

2 5.4%

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 work as expected in cats?: 37 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 29 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

Didn't work as expected after Emodepside + Praziquantel (Profender) 46 reports · 0.8% of its reports
Didn't work as expected after Praziquantel 26 reports · 1.6% of its reports
Didn't work as expected after Praziquantel + Pyrantel 38 reports · 3.0% of its reports

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