Blood in stool after Ampicillin in dogs

The FDA has received 34 reports of blood in stool in dogs after Ampicillin. That is 3.5% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported unusually often with this medicine.

34Reports
85%Marked serious
18%Recovered
53%Died or euthanised
10 daysTypical onset
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How soon it started

Same day
2 6.9%
1–2 days
5 17%
3–7 days
3 10%
1–4 weeks
11 38%
Over a month
8 28%

How the animals did

Recovered
6 18%
Still unwell when reported
8 24%
Died
6 18%
Euthanised
12 35%
Not known
2 5.9%

Problems reported at the same time

Age of the animals

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

About this medicine

Type: medicine.

Questions owners ask

Can Ampicillin cause blood in stool in dogs?
34 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 10 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).

Blood in stool with similar medicines

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