Diarrhea after Amoxicillin in cats

63 reports to the FDA describe diarrhea in cats given Amoxicillin. That is 12% 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.

63Reports

33%Marked serious

21%Recovered

13%Died or euthanised

3 daysTypical onset

How soon it started

Same day

8 20%

1–2 days

7 18%

3–7 days

15 38%

1–4 weeks

8 20%

Over a month

2 5.0%

How the animals did

Recovered

13 21%

Still unwell when reported

11 17%

Died

4 6.3%

Euthanised

4 6.3%

Not known

31 49%

Problems reported at the same time

24 38%

16 25%

15 24%

9 14%

7 11%

6 9.5%

Didn't work as expected

6 9.5%

Fever

5 7.9%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Amoxicillin treats bacterial infections.

Questions owners ask

Can Amoxicillin cause diarrhea in cats?: 63 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).

Diarrhea with similar medicines

Diarrhea after Cefovecin (Convenia) 701 reports · 8.1% of its reports
Diarrhea after Amoxicillin + Clavulanate (Clavamox) 317 reports · 13% of its reports
Diarrhea after Enrofloxacin (Baytril) 46 reports · 2.9% of its reports
Diarrhea after Metronidazole 127 reports · 32% of its reports

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