Hair loss after Praziquantel in cats

85 reports to the FDA describe hair loss in cats given Praziquantel. That is 5.1% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported less often than average with this medicine.

85Reports

39%Marked serious

11%Recovered

0.0%Died or euthanised

5 daysTypical onset

How soon it started

Same day

10 24%

1–2 days

7 17%

3–7 days

7 17%

1–4 weeks

18 43%

Over a month

0 0.0%

How the animals did

Recovered

9 11%

Still unwell when reported

13 15%

Not known

63 74%

Problems reported at the same time

Injection site reaction

34 40%

Itching

22 26%

Application site reaction

13 15%

Didn't stop worms

13 15%

Skin rash or irritation

8 9.4%

Skin redness

8 9.4%

Lethargy

7 8.2%

Swelling

5 5.9%

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 hair loss in cats?: 85 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 5 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).

Hair loss with similar medicines

Hair loss after Emodepside + Praziquantel (Profender) 1,685 reports · 29% of its reports
Hair loss after Praziquantel + Pyrantel 44 reports · 3.5% of its reports

All reported side effects of Praziquantel in cats · Medicines most reported with hair loss