Fever after Ampicillin in dogs

The FDA has received 138 reports of fever in dogs after Ampicillin. That is 14% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

138Reports
81%Marked serious
3.6%Recovered
57%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
33 29%
1–2 days
21 18%
3–7 days
14 12%
1–4 weeks
21 18%
Over a month
26 23%

How the animals did

Recovered
5 3.6%
Still unwell when reported
38 28%
Died
25 18%
Euthanised
53 38%
Not known
17 12%

Problems reported at the same time

Age of the animals

Under 1 year
24
1–3 years
30
4–7 years
27
8–11 years
36
12+ years
18

About this medicine

Type: medicine.

Questions owners ask

Can Ampicillin cause fever in dogs?
138 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 3 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).

Fever with similar medicines

All reported side effects of Ampicillin in dogs · Medicines most reported with fever