Lethargy after Cetirizine in dogs

101 reports to the FDA describe lethargy in dogs given Cetirizine. That is 15% of all reports for this medicine, compared with 11% across reports for all dog medicines.

101Reports
43%Marked serious
35%Recovered
11%Died or euthanised
18 daysTypical onset
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How soon it started

Same day
20 26%
1–2 days
7 9.0%
3–7 days
8 10%
1–4 weeks
10 13%
Over a month
33 42%

How the animals did

Recovered
32 32%
Recovered with lasting effects
3 3.0%
Still unwell when reported
36 36%
Died
4 4.0%
Euthanised
7 6.9%
Not known
19 19%

Problems reported at the same time

Age of the animals

Under 1 year
4
1–3 years
25
4–7 years
35
8–11 years
28
12+ years
9

About this medicine

Type: medicine.

Questions owners ask

Can Cetirizine cause lethargy in dogs?
101 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 18 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

All reported side effects of Cetirizine in dogs · Medicines most reported with lethargy