Didn't stop fleas after Praziquantel in cats

The FDA has received 24 reports of didn't stop fleas in cats after Praziquantel. That is 1.4% of all reports for this medicine, compared with 8.4% across reports for all cat medicines, so it is reported less often than average with this medicine.

24Reports

21%Marked serious

0.0%Recovered

0.0%Died or euthanised

20 daysTypical onset

How soon it started

Same day

5 25%

1–2 days

1 5.0%

3–7 days

1 5.0%

1–4 weeks

4 20%

Over a month

9 45%

How the animals did

Still unwell when reported

7 29%

Not known

17 71%

Problems reported at the same time

14 58%

10 42%

5 21%

4 17%

Eye disorder (for photophobia see 'neurological')

4 17%

Skin redness

4 17%

Application site reaction

4 17%

Dry skin

4 17%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Praziquantel treats tapeworms.

Questions owners ask

Can Praziquantel cause didn't stop fleas in cats?: 24 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 20 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 Emodepside + Praziquantel (Profender) 26 reports · 0.5% of its reports

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