Injection site reaction after Lufenuron in cats

304 reports to the FDA describe injection site reaction in cats given Lufenuron. That is 27% of all reports for this medicine, compared with 1.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

304Reports

13%Marked serious

9.5%Recovered

1.0%Died or euthanised

8 daysTypical onset

How soon it started

Same day

3 5.2%

1–2 days

8 14%

3–7 days

18 31%

1–4 weeks

16 28%

Over a month

13 22%

How the animals did

Recovered

29 9.5%

Still unwell when reported

43 14%

Died

2 0.7%

Euthanised

1 0.3%

Not known

229 75%

Problems reported at the same time

46 15%

35 12%

32 11%

25 8.2%

20 6.6%

15 4.9%

Skin rash or irritation

8 2.6%

Vomiting

7 2.3%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Lufenuron stops flea eggs from developing.

Questions owners ask

Can Lufenuron cause injection site reaction in cats?: 304 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 8 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).

All reported side effects of Lufenuron in cats · Medicines most reported with injection site reaction