Blood problems after Enrofloxacin (Baytril) in cats

The FDA has received 66 reports of blood problems in cats after Enrofloxacin. That is 4.2% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

66Reports
64%Marked serious
1.5%Recovered
56%Died or euthanised
9 daysTypical onset
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How soon it started

Same day
3 8.1%
1–2 days
9 24%
3–7 days
6 16%
1–4 weeks
10 27%
Over a month
9 24%

How the animals did

Recovered
1 1.5%
Still unwell when reported
10 15%
Died
10 15%
Euthanised
27 41%
Not known
18 27%

Problems reported at the same time

Age of the animals

Under 1 year
8
1–3 years
15
4–7 years
14
8–11 years
9
12+ years
18

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 blood problems in cats?
66 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 9 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).

Blood problems with similar medicines

All reported side effects of Enrofloxacin in cats · Medicines most reported with blood problems