Didn't stop worms after Praziquantel + Pyrantel in cats

81 reports to the FDA describe didn't stop worms in cats given Praziquantel + Pyrantel. That is 6.4% of all reports for this medicine, compared with 1.8% across reports for all cat medicines, so it is reported unusually often with this medicine.

81Reports

32%Marked serious

19%Recovered

0.0%Died or euthanised

16 daysTypical onset

How soon it started

Same day

8 17%

1–2 days

8 17%

3–7 days

2 4.3%

1–4 weeks

11 24%

Over a month

17 37%

How the animals did

Recovered

15 19%

Still unwell when reported

1 1.2%

Not known

65 80%

Problems reported at the same time

14 17%

10 12%

6 7.4%

4 4.9%

4 4.9%

3 3.7%

3 3.7%

Blood in faeces

3 3.7%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Praziquantel treats tapeworms. Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Praziquantel + Pyrantel cause didn't stop worms in cats?: 81 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 16 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

Didn't stop worms after Emodepside + Praziquantel (Profender) 509 reports · 8.9% of its reports
Didn't stop worms after Praziquantel 372 reports · 22% of its reports
Didn't stop worms after Pyrantel 51 reports · 9.1% of its reports
Didn't stop worms after Fenbendazole 33 reports · 12% of its reports

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