Didn't stop fleas after Hydroxyzine in dogs

The FDA has received 28 reports of didn't stop fleas in dogs after Hydroxyzine. That is 2.7% of all reports for this medicine, compared with 6.2% across reports for all dog medicines, so it is reported less often than average with this medicine.

28Reports
11%Marked serious
21%Recovered
0.0%Died or euthanised
101 daysTypical onset
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How soon it started

Same day
1 6.7%
1–2 days
1 6.7%
3–7 days
0 0.0%
1–4 weeks
2 13%
Over a month
11 73%

How the animals did

Recovered
1 3.6%
Recovered with lasting effects
5 18%
Still unwell when reported
5 18%
Not known
17 61%

Problems reported at the same time

Didn't work as expected
10 36%
Itching
8 29%
Drug dose omission
2 7.1%
Unpalatable
1 3.6%
Skin rash or irritation
1 3.6%
Uncoded sign
1 3.6%
Self trauma
1 3.6%
Joint pain
1 3.6%

Age of the animals

Under 1 year
0
1–3 years
7
4–7 years
8
8–11 years
10
12+ years
3

About this medicine

Type: medicine.

Questions owners ask

Can Hydroxyzine cause didn't stop fleas in dogs?
28 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 101 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).

Didn't stop fleas with similar medicines

All reported side effects of Hydroxyzine in dogs · Medicines most reported with didn't stop fleas