Monocytosis after Furosemide in dogs

The FDA has received 23 reports of monocytosis in dogs after Furosemide. That is 1.5% of all reports for this medicine, compared with 0.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

23Reports
91%Marked serious
0.0%Recovered
65%Died or euthanised
12 daysTypical onset
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How soon it started

Same day
3 20%
1–2 days
3 20%
3–7 days
1 6.7%
1–4 weeks
1 6.7%
Over a month
7 47%

How the animals did

Still unwell when reported
4 17%
Died
8 35%
Euthanised
7 30%
Not known
4 17%

Problems reported at the same time

Age of the animals

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

About this medicine

Type: medicine.

Questions owners ask

Can Furosemide cause monocytosis in dogs?
23 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 12 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).

Monocytosis with similar medicines

All reported side effects of Furosemide in dogs · Medicines most reported with monocytosis