Polymyxin B side effects in cats

198 reports sent to the FDA between 1995 and 2026 involve Polymyxin B in cats. The most reported problems were swelling, vomiting, allergic reaction. 21% were marked serious, and where it was recorded, signs eased after stopping the medicine in 100% of cases.

198Reports
21%Marked serious
67%Only medicine involved
16%Recovered
6.1%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

44 22%
44 22%
22 11%
Itching
19 9.6%
Diarrhea
16 8.1%
Loss of appetite
16 8.1%
Eye irritation
15 7.6%
Breathing problems
15 7.6%
Ocular discharge
11 5.6%
Hair loss
11 5.6%
Swollen eye
11 5.6%
Squinting
10 5.1%

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.

How soon problems started

Same day
47 43%
1–2 days
22 20%
3–7 days
14 13%
1–4 weeks
16 15%
Over a month
11 10%

Time from the first dose to the first sign, where both dates were reported (110 reports).

How the animals did

Recovered
31 16%
Still unwell when reported
53 27%
Died
10 5.1%
Euthanised
2 1.0%
Not known
102 52%

Breeds named most often

Popular breeds appear more often because there are more of them.

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