Lethargy after Furosemide in cats

The FDA has received 71 reports of lethargy in cats after Furosemide. That is 23% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

71Reports
82%Marked serious
11%Recovered
54%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
22 36%
1–2 days
13 21%
3–7 days
6 9.8%
1–4 weeks
10 16%
Over a month
10 16%

How the animals did

Recovered
8 11%
Still unwell when reported
11 15%
Died
17 24%
Euthanised
21 30%
Not known
14 20%

Problems reported at the same time

Age of the animals

Under 1 year
7
1–3 years
6
4–7 years
14
8–11 years
22
12+ years
20

About this medicine

Type: medicine.

Questions owners ask

Can Furosemide cause lethargy in cats?
71 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).

Lethargy with similar medicines

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