Fever after Amoxicillin in cats

30 reports to the FDA describe fever in cats given Amoxicillin. That is 5.8% of all reports for this medicine, compared with 3.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

30Reports

40%Marked serious

10%Recovered

23%Died or euthanised

10 daysTypical onset

How soon it started

Same day

2 14%

1–2 days

0 0.0%

3–7 days

3 21%

1–4 weeks

7 50%

Over a month

2 14%

How the animals did

Recovered

3 10%

Still unwell when reported

6 20%

Died

6 20%

Euthanised

1 3.3%

Not known

14 47%

Problems reported at the same time

14 47%

12 40%

7 23%

6 20%

5 17%

5 17%

4 13%

Dehydration

4 13%

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 fever in cats?: 30 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).

Fever with similar medicines

Fever after Cefovecin (Convenia) 715 reports · 8.2% of its reports
Fever after Amoxicillin + Clavulanate (Clavamox) 129 reports · 5.4% of its reports
Fever after Enrofloxacin (Baytril) 64 reports · 4.1% of its reports
Fever after Doxycycline 35 reports · 14% of its reports

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