Zyrtec side effects in dogs

50 reports sent to the FDA between 2013 and 2026 involve Zyrtec in dogs. The most reported problems were vomiting, itching, lethargy. 58% were marked serious.

50Reports
58%Marked serious
0.0%Only medicine involved
20%Recovered
12%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

Vomiting
11 22%
Itching
7 14%
Lethargy
7 14%
Loss of appetite
7 14%
Seizures
7 14%
Overdose
5 10%
Behaviour change
4 8.0%
Skin rash or irritation
4 8.0%
Breathing problems
4 8.0%
Hair loss
4 8.0%
Liver problems
4 8.0%
Wobbliness (ataxia)
4 8.0%
Restlessness or agitation
3 6.0%
Diarrhea
3 6.0%
Fever
3 6.0%

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 work as expected
6 12%

How soon problems started

Same day
15 33%
1–2 days
6 13%
3–7 days
6 13%
1–4 weeks
6 13%
Over a month
12 27%

Time from the first dose to the first sign, where both dates were reported (45 reports).

How the animals did

Recovered
10 20%
Still unwell when reported
26 52%
Died
1 2.0%
Euthanised
5 10%
Not known
8 16%

Breeds named most often

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

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