Didn't work as expected after Cefazolin in dogs

The FDA has received 48 reports of didn't work as expected in dogs after Cefazolin. That is 11% of all reports for this medicine, compared with 13% across reports for all dog medicines.

48Reports
73%Marked serious
19%Recovered
50%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
10 24%
1–2 days
8 20%
3–7 days
7 17%
1–4 weeks
8 20%
Over a month
8 20%

How the animals did

Recovered
8 17%
Recovered with lasting effects
1 2.1%
Still unwell when reported
11 23%
Died
11 23%
Euthanised
13 27%
Not known
4 8.3%

Problems reported at the same time

Age of the animals

Under 1 year
19
1–3 years
5
4–7 years
10
8–11 years
11
12+ years
2

About this medicine

Type: medicine.

Questions owners ask

Can Cefazolin cause didn't work as expected in dogs?
48 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 3 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).

Didn't work as expected with similar medicines

All reported side effects of Cefazolin in dogs · Medicines most reported with didn't work as expected