Lethargy after Fluoxetine in cats

38 reports to the FDA describe lethargy in cats given Fluoxetine. That is 16% of all reports for this medicine, compared with 14% across reports for all cat medicines.

38Reports

47%Marked serious

13%Recovered

16%Died or euthanised

38 daysTypical onset

How soon it started

Same day

3 18%

1–2 days

1 5.9%

3–7 days

3 18%

1–4 weeks

0 0.0%

Over a month

10 59%

How the animals did

Recovered

4 11%

Recovered with lasting effects

1 2.6%

Still unwell when reported

14 37%

Euthanised

6 16%

Not known

13 34%

Problems reported at the same time

23 61%

8 21%

8 21%

7 18%

Liver problems

6 16%

Death

6 16%

Kidney problems

6 16%

Hyperglycaemia

6 16%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Fluoxetine treats anxiety and behaviour problems.

Questions owners ask

Can Fluoxetine cause lethargy in cats?: 38 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 38 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

Lethargy after Gabapentin 342 reports · 17% of its reports
Lethargy after Clomipramine (Clomicalm) 35 reports · 28% of its reports

All reported side effects of Fluoxetine in cats · Medicines most reported with lethargy