Mirtazapine (Mirataz) side effects in dogs

289 reports sent to the FDA between 2012 and 2026 involve Mirtazapine in dogs. The most reported problems were loss of appetite, vomiting, lethargy. 67% were marked serious, and where it was recorded, signs eased after stopping the medicine in 100% of cases.

289Reports
67%Marked serious
2.1%Only medicine involved
18%Recovered
35%Died or euthanised
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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.

Most reported side effects

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a dog still getting fleas or heartworm), not about a side effect.

Didn't stop worms
2 0.7%
Didn't stop fleas
1 0.3%

How soon problems started

Same day
38 16%
1–2 days
35 15%
3–7 days
26 11%
1–4 weeks
62 26%
Over a month
73 31%

Time from the first dose to the first sign, where both dates were reported (234 reports).

How the animals did

Recovered
52 18%
Recovered with lasting effects
1 0.3%
Still unwell when reported
95 33%
Died
30 10%
Euthanised
71 25%
Not known
40 14%

Breeds named most often

Popular breeds appear more often because there are more of them.

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