Bradycardia after Cefazolin in dogs

22 reports to the FDA describe bradycardia in dogs given Cefazolin. That is 5.2% 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.

22Reports
86%Marked serious
59%Recovered
23%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
16 73%
1–2 days
2 9.1%
3–7 days
2 9.1%
1–4 weeks
2 9.1%
Over a month
0 0.0%

How the animals did

Recovered
13 59%
Still unwell when reported
3 14%
Died
5 23%
Not known
1 4.5%

Problems reported at the same time

5 23%
Premature ventricular contractions
5 23%
Heart block 3rd degree
5 23%

Age of the animals

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

About this medicine

Type: medicine.

Questions owners ask

Can Cefazolin cause bradycardia in dogs?
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).

Bradycardia with similar medicines

All reported side effects of Cefazolin in dogs · Medicines most reported with bradycardia