Liver problems after Ampicillin in cats

65 reports to the FDA describe liver problems in cats given Ampicillin. That is 22% of all reports for this medicine, compared with 2.8% across reports for all cat medicines, so it is reported unusually often with this medicine.

65Reports
89%Marked serious
9.2%Recovered
52%Died or euthanised
2 daysTypical onset
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How soon it started

Same day
13 24%
1–2 days
17 31%
3–7 days
7 13%
1–4 weeks
6 11%
Over a month
12 22%

How the animals did

Recovered
6 9.2%
Still unwell when reported
17 26%
Died
5 7.7%
Euthanised
29 45%
Not known
8 12%

Problems reported at the same time

Age of the animals

Under 1 year
4
1–3 years
7
4–7 years
18
8–11 years
19
12+ years
17

About this medicine

Type: medicine.

Questions owners ask

Can Ampicillin cause liver problems in cats?
65 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 2 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).

Liver problems with similar medicines

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