Lethargy after Hydroxyzine in dogs

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

160Reports
48%Marked serious
43%Recovered
7.5%Died or euthanised
41 daysTypical onset
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How soon it started

Same day
20 18%
1–2 days
10 8.8%
3–7 days
7 6.2%
1–4 weeks
14 12%
Over a month
62 55%

How the animals did

Recovered
59 37%
Recovered with lasting effects
9 5.6%
Still unwell when reported
57 36%
Died
5 3.1%
Euthanised
7 4.4%
Not known
23 14%

Problems reported at the same time

Age of the animals

Under 1 year
15
1–3 years
36
4–7 years
43
8–11 years
52
12+ years
12

About this medicine

Type: medicine.

Questions owners ask

Can Hydroxyzine cause lethargy in dogs?
160 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 41 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 Hydroxyzine in dogs · Medicines most reported with lethargy