Abnormal ultrasound finding after Mirtazapine (Mirataz) in dogs

37 reports to the FDA describe abnormal ultrasound finding in dogs given Mirtazapine. That is 13% of all reports for this medicine, compared with 0.5% across reports for all dog medicines, so it is reported unusually often with this medicine.

37Reports

81%Marked serious

11%Recovered

43%Died or euthanised

12 daysTypical onset

How soon it started

Same day

4 13%

1–2 days

6 20%

3–7 days

2 6.7%

1–4 weeks

12 40%

Over a month

6 20%

How the animals did

Recovered

4 11%

Still unwell when reported

14 38%

Died

5 14%

Euthanised

11 30%

Not known

3 8.1%

Problems reported at the same time

34 92%

27 73%

26 70%

24 65%

19 51%

16 43%

14 38%

12 32%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Mirtazapine stimulates appetite (cats: ointment applied to the ear).

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

Questions owners ask

Can Mirtazapine cause abnormal ultrasound finding in dogs?: 37 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 12 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).

Abnormal ultrasound finding with similar medicines

Abnormal ultrasound finding after Maropitant (Cerenia) 594 reports · 5.0% of its reports
Abnormal ultrasound finding after Capromorelin (Entyce) 54 reports · 3.6% of its reports

All reported side effects of Mirtazapine in dogs · Medicines most reported with abnormal ultrasound finding