Lameness after Ilunocitinib (Zenrelia) in dogs

37 reports to the FDA describe lameness in dogs given Ilunocitinib. That is 1.7% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported unusually often with this medicine.

37Reports

41%Marked serious

16%Recovered

14%Died or euthanised

132 daysTypical onset

How soon it started

Same day

2 6.5%

1–2 days

0 0.0%

3–7 days

1 3.2%

1–4 weeks

5 16%

Over a month

23 74%

How the animals did

Recovered

6 16%

Still unwell when reported

17 46%

Died

1 2.7%

Euthanised

4 11%

Not known

9 24%

Problems reported at the same time

9 24%

9 24%

8 22%

7 19%

7 19%

7 19%

Musculoskeletal disorder

6 16%

Diarrhea

6 16%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Ilunocitinib controls itching from allergies (tablet, a JAK inhibitor).

Products with this ingredient include Zenrelia. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Questions owners ask

Can Ilunocitinib cause lameness in dogs?: 37 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 132 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).

Lameness with similar medicines

Lameness after Oclacitinib (Apoquel) 316 reports · 1.1% of its reports
Lameness after Cyclosporine (Atopica) 151 reports · 1.0% of its reports

All reported side effects of Ilunocitinib in dogs · Medicines most reported with lameness