Lethargy after Mirtazapine (Mirataz) in cats

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

305Reports

70%Marked serious

15%Recovered

34%Died or euthanised

3 daysTypical onset

How soon it started

Same day

75 27%

1–2 days

53 19%

3–7 days

44 16%

1–4 weeks

49 18%

Over a month

52 19%

How the animals did

Recovered

47 15%

Still unwell when reported

95 31%

Died

45 15%

Euthanised

58 19%

Not known

60 20%

Problems reported at the same time

206 68%

103 34%

72 24%

69 23%

69 23%

65 21%

57 19%

49 16%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

132

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 lethargy in cats?: 305 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 3 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 Maropitant (Cerenia) 926 reports · 24% of its reports
Lethargy after Capromorelin (Entyce) 198 reports · 24% of its reports

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