Lethargy after Firocoxib (Previcox) in dogs

The FDA has received 1,294 reports of lethargy in dogs after Firocoxib. That is 16% of all reports for this medicine, compared with 11% across reports for all dog medicines.

1,294Reports
34%Marked serious
10%Recovered
31%Died or euthanised
5 daysTypical onset
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How soon it started

Same day
65 13%
1–2 days
92 19%
3–7 days
140 29%
1–4 weeks
100 21%
Over a month
90 18%

How the animals did

Recovered
130 10%
Recovered with lasting effects
5 0.4%
Still unwell when reported
99 7.7%
Died
307 24%
Euthanised
89 6.9%
Not known
664 51%

Problems reported at the same time

Age of the animals

Under 1 year
52
1–3 years
155
4–7 years
277
8–11 years
491
12+ years
271

About this medicine

Firocoxib relieves pain and inflammation from arthritis.

Products with this ingredient include Previcox. 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 Firocoxib cause lethargy in dogs?
1,294 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 5 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).

Lethargy with similar medicines

All reported side effects of Firocoxib in dogs · Medicines most reported with lethargy