Wobbliness (ataxia) after Amoxicillin in cats

The FDA has received 26 reports of wobbliness (ataxia) in cats after Amoxicillin. That is 5.1% of all reports for this medicine, compared with 4.7% across reports for all cat medicines.

26Reports

69%Marked serious

23%Recovered

38%Died or euthanised

1 daysTypical onset

How soon it started

Same day

9 50%

1–2 days

7 39%

3–7 days

1 5.6%

1–4 weeks

1 5.6%

Over a month

0 0.0%

How the animals did

Recovered

6 23%

Still unwell when reported

2 7.7%

Died

6 23%

Euthanised

4 15%

Not known

8 31%

Problems reported at the same time

10 38%

9 35%

7 27%

5 19%

Tremors

5 19%

Weight loss

5 19%

Vomiting

4 15%

Vocalising

4 15%

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 wobbliness (ataxia) in cats?: 26 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).

Wobbliness (ataxia) with similar medicines

Wobbliness (ataxia) after Cefovecin (Convenia) 704 reports · 8.1% of its reports
Wobbliness (ataxia) after Amoxicillin + Clavulanate (Clavamox) 145 reports · 6.1% of its reports
Wobbliness (ataxia) after Enrofloxacin (Baytril) 127 reports · 8.0% of its reports
Wobbliness (ataxia) after Metronidazole 27 reports · 6.9% of its reports
Wobbliness (ataxia) after Doxycycline 20 reports · 7.7% of its reports

All reported side effects of Amoxicillin in cats · Medicines most reported with wobbliness (ataxia)