Allergic reaction after Polymyxin B in cats

The FDA has received 24 reports of allergic reaction in cats after Polymyxin B. That is 12% of all reports for this medicine, compared with 0.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

24Reports
33%Marked serious
25%Recovered
8.3%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
9 82%
1–2 days
2 18%
3–7 days
0 0.0%
1–4 weeks
0 0.0%
Over a month
0 0.0%

How the animals did

Recovered
6 25%
Still unwell when reported
4 17%
Died
2 8.3%
Not known
12 50%

Problems reported at the same time

18 75%
12 50%
Diarrhea
8 33%
Breathing problems
8 33%
Drooling
5 21%
Death
2 8.3%

Age of the animals

Under 1 year
9
1–3 years
6
4–7 years
1
8–11 years
5
12+ years
1

About this medicine

Type: medicine.

Questions owners ask

Can Polymyxin B cause allergic reaction in cats?
24 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 the same 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).

Allergic reaction with similar medicines

All reported side effects of Polymyxin B in cats · Medicines most reported with allergic reaction