Mass after Oclacitinib (Apoquel) in dogs

103 reports to the FDA describe mass in dogs given Oclacitinib. That is 0.4% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

103Reports

63%Marked serious

8.7%Recovered

12%Died or euthanised

29 daysTypical onset

How soon it started

Same day

18 27%

1–2 days

4 6.0%

3–7 days

1 1.5%

1–4 weeks

12 18%

Over a month

32 48%

How the animals did

Recovered

9 8.7%

Still unwell when reported

52 50%

Died

7 6.8%

Euthanised

5 4.9%

Not known

30 29%

Problems reported at the same time

Didn't work as expected

20 19%

12 12%

12 12%

12 12%

11 11%

10 9.7%

10 9.7%

8 7.8%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

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

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

Questions owners ask

Can Oclacitinib cause mass in dogs?: 103 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 29 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).

Mass with similar medicines

Mass after Ilunocitinib (Zenrelia) 32 reports · 1.5% of its reports

All reported side effects of Oclacitinib in dogs · Medicines most reported with mass