Weight gain after Fluoxetine in dogs

21 reports to the FDA describe weight gain in dogs given Fluoxetine. That is 0.8% of all reports for this medicine, compared with 0.6% across reports for all dog medicines.

21Reports

33%Marked serious

43%Recovered

0.0%Died or euthanised

127 daysTypical onset

How soon it started

Same day

2 17%

1–2 days

0 0.0%

3–7 days

1 8.3%

1–4 weeks

2 17%

Over a month

7 58%

How the animals did

Recovered

4 19%

Recovered with lasting effects

5 24%

Still unwell when reported

3 14%

Not known

9 43%

Problems reported at the same time

Didn't work as expected

7 33%

Behaviour change

5 24%

Vomiting

4 19%

Loss of appetite

4 19%

Didn't prevent heartworm

4 19%

Liver problems

3 14%

Excessive thirst

2 9.5%

Weight loss

2 9.5%

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 weight gain in dogs?: 21 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 127 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).

Weight gain with similar medicines

Weight gain after Gabapentin 70 reports · 0.8% of its reports
Weight gain after Trazodone 38 reports · 1.5% of its reports

All reported side effects of Fluoxetine in dogs · Medicines most reported with weight gain