Behaviour change after Enrofloxacin (Baytril) in cats

The FDA has received 132 reports of behaviour change in cats after Enrofloxacin. That is 8.4% of all reports for this medicine, compared with 5.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

132Reports
55%Marked serious
14%Recovered
23%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
30 38%
1–2 days
16 20%
3–7 days
13 16%
1–4 weeks
11 14%
Over a month
10 13%

How the animals did

Recovered
15 11%
Recovered with lasting effects
4 3.0%
Still unwell when reported
12 9.1%
Died
17 13%
Euthanised
13 9.8%
Not known
71 54%

Problems reported at the same time

Age of the animals

Under 1 year
6
1–3 years
24
4–7 years
31
8–11 years
35
12+ years
31

About this medicine

Enrofloxacin treats bacterial infections.

Products with this ingredient include Baytril. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Questions owners ask

Can Enrofloxacin cause behaviour change in cats?
132 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).

Behaviour change with similar medicines

All reported side effects of Enrofloxacin in cats · Medicines most reported with behaviour change