Lethargy after Polymyxin B in cats

The FDA has received 22 reports of lethargy in cats after Polymyxin B. That is 11% of all reports for this medicine, compared with 14% across reports for all cat medicines.

22Reports
27%Marked serious
18%Recovered
4.5%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
8 53%
1–2 days
4 27%
3–7 days
2 13%
1–4 weeks
0 0.0%
Over a month
1 6.7%

How the animals did

Recovered
4 18%
Still unwell when reported
8 36%
Died
1 4.5%
Not known
9 41%

Problems reported at the same time

Loss of appetite
8 36%
Diarrhea
3 14%
Drooling
3 14%
Blepharospasm
3 14%
Breathing problems
3 14%

Age of the animals

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

About this medicine

Type: medicine.

Questions owners ask

Can Polymyxin B cause lethargy in cats?
22 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).

Lethargy with similar medicines

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