Mass after Carprofen (Rimadyl) in dogs

The FDA has received 53 reports of mass in dogs after Carprofen. That is 0.1% 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.

53Reports

83%Marked serious

3.8%Recovered

30%Died or euthanised

29 daysTypical onset

How soon it started

Same day

11 24%

1–2 days

1 2.2%

3–7 days

7 15%

1–4 weeks

7 15%

Over a month

20 43%

How the animals did

Recovered

2 3.8%

Still unwell when reported

25 47%

Died

2 3.8%

Euthanised

14 26%

Not known

10 19%

Problems reported at the same time

19 36%

19 36%

17 32%

16 30%

14 26%

13 25%

11 21%

11 21%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Carprofen relieves pain and inflammation from arthritis or after surgery.

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

NSAIDs can affect the stomach, liver and kidneys. Vets usually recommend blood tests before and during long-term use.

Questions owners ask

Can Carprofen cause mass in dogs?: 53 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 Grapiprant (Galliprant) 37 reports · 0.4% of its reports

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