Didn't work as expected after Amoxicillin in cats

49 reports to the FDA describe didn't work as expected in cats given Amoxicillin. That is 9.6% of all reports for this medicine, compared with 8.7% across reports for all cat medicines.

49Reports

29%Marked serious

2.0%Recovered

20%Died or euthanised

10 daysTypical onset

How soon it started

Same day

2 8.3%

1–2 days

4 17%

3–7 days

6 25%

1–4 weeks

7 29%

Over a month

5 21%

How the animals did

Recovered

1 2.0%

Still unwell when reported

10 20%

Died

6 12%

Euthanised

4 8.2%

Not known

28 57%

Problems reported at the same time

11 22%

10 20%

8 16%

7 14%

6 12%

4 8.2%

4 8.2%

Blood problems

4 8.2%

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 didn't work as expected in cats?: 49 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).

Didn't work as expected with similar medicines

Didn't work as expected after Cefovecin (Convenia) 1,260 reports · 15% of its reports
Didn't work as expected after Amoxicillin + Clavulanate (Clavamox) 410 reports · 17% of its reports
Didn't work as expected after Enrofloxacin (Baytril) 51 reports · 3.2% of its reports
Didn't work as expected after Metronidazole 33 reports · 8.4% of its reports
Didn't work as expected after Doxycycline 35 reports · 14% of its reports

All reported side effects of Amoxicillin in cats · Medicines most reported with didn't work as expected