Swelling after Lufenuron in cats

121 reports to the FDA describe swelling in cats given Lufenuron. That is 11% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

121Reports

3.3%Marked serious

3.3%Recovered

7.4%Died or euthanised

–Typical onset

How the animals did

Recovered

4 3.3%

Still unwell when reported

9 7.4%

Died

9 7.4%

Not known

99 82%

Problems reported at the same time

Injection site reaction

46 38%

15 12%

14 12%

13 11%

10 8.3%

9 7.4%

7 5.8%

7 5.8%

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 swelling in cats?: 121 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.
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).

Swelling with similar medicines

Swelling after Spinosad (Comfortis) 40 reports · 0.3% of its reports
Swelling after Nitenpyram (Capstar) 44 reports · 0.5% of its reports
Swelling after Imidacloprid + Moxidectin (Advantage Multi) 72 reports · 0.9% of its reports

All reported side effects of Lufenuron in cats · Medicines most reported with swelling