Seizures after Amoxicillin in cats

The FDA has received 26 reports of seizures in cats after Amoxicillin. That is 5.1% of all reports for this medicine, compared with 2.6% across reports for all cat medicines, so it is reported unusually often with this medicine.

26Reports

62%Marked serious

12%Recovered

58%Died or euthanised

1 daysTypical onset

How soon it started

Same day

7 50%

1–2 days

5 36%

3–7 days

0 0.0%

1–4 weeks

2 14%

Over a month

0 0.0%

How the animals did

Recovered

3 12%

Still unwell when reported

3 12%

Died

12 46%

Euthanised

3 12%

Not known

5 19%

Problems reported at the same time

15 58%

6 23%

5 19%

5 19%

Hypoglycaemia

4 15%

Disorientation

4 15%

Itching

3 12%

Hypothermia

3 12%

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 seizures 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).

Seizures with similar medicines

Seizures after Cefovecin (Convenia) 521 reports · 6.0% of its reports
Seizures after Amoxicillin + Clavulanate (Clavamox) 94 reports · 3.9% of its reports
Seizures after Enrofloxacin (Baytril) 145 reports · 9.2% of its reports

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