Vomiting after Benadryl in dogs

73 reports to the FDA describe vomiting in dogs given Benadryl. That is 30% of all reports for this medicine, compared with 28% across reports for all dog medicines.

73Reports
84%Marked serious
21%Recovered
11%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
41 61%
1–2 days
6 9.0%
3–7 days
5 7.5%
1–4 weeks
5 7.5%
Over a month
10 15%

How the animals did

Recovered
15 21%
Still unwell when reported
44 60%
Died
4 5.5%
Euthanised
4 5.5%
Not known
6 8.2%

Problems reported at the same time

Age of the animals

Under 1 year
6
1–3 years
26
4–7 years
19
8–11 years
16
12+ years
6

About this medicine

Type: medicine.

Questions owners ask

Can Benadryl cause vomiting in dogs?
73 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 the same day 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).

Vomiting with similar medicines

All reported side effects of Benadryl in dogs · Medicines most reported with vomiting