Diarrhea after Pyrantel in cats

The FDA has received 70 reports of diarrhea in cats after Pyrantel. That is 13% of all reports for this medicine, compared with 5.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

70Reports

34%Marked serious

7.1%Recovered

17%Died or euthanised

2 daysTypical onset

How soon it started

Same day

4 11%

1–2 days

18 49%

3–7 days

4 11%

1–4 weeks

5 14%

Over a month

6 16%

How the animals did

Recovered

5 7.1%

Still unwell when reported

23 33%

Died

11 16%

Euthanised

1 1.4%

Not known

30 43%

Problems reported at the same time

29 41%

25 36%

21 30%

13 19%

8 11%

7 10%

6 8.6%

6 8.6%

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 diarrhea in cats?: 70 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 2 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).

Diarrhea with similar medicines

Diarrhea after Emodepside + Praziquantel (Profender) 238 reports · 4.2% of its reports
Diarrhea after Praziquantel 135 reports · 8.1% of its reports
Diarrhea after Praziquantel + Pyrantel 85 reports · 6.7% of its reports
Diarrhea after Fenbendazole 34 reports · 12% of its reports

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