Diarrhea after Ampicillin in cats

29 reports to the FDA describe diarrhea in cats given Ampicillin. That is 9.6% of all reports for this medicine, compared with 5.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

29Reports
79%Marked serious
14%Recovered
38%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
8 33%
1–2 days
7 29%
3–7 days
3 13%
1–4 weeks
3 13%
Over a month
3 13%

How the animals did

Recovered
3 10%
Recovered with lasting effects
1 3.4%
Still unwell when reported
12 41%
Died
1 3.4%
Euthanised
10 34%
Not known
2 6.9%

Problems reported at the same time

Age of the animals

Under 1 year
5
1–3 years
4
4–7 years
5
8–11 years
5
12+ years
10

About this medicine

Type: medicine.

Questions owners ask

Can Ampicillin cause diarrhea in cats?
29 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 1 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).

Diarrhea with similar medicines

All reported side effects of Ampicillin in cats · Medicines most reported with diarrhea