Cefazolin side effects in dogs

421 reports sent to the FDA between 2006 and 2026 involve Cefazolin in dogs. The most reported problems were loss of appetite, vomiting, lethargy. 74% were marked serious, and where it was recorded, signs eased after stopping the medicine in 50% of cases.

421Reports
74%Marked serious
0.7%Only medicine involved
29%Recovered
39%Died or euthanised
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

About this medicine

Type: medicine.

Most reported side effects

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a dog still getting fleas or heartworm), not about a side effect.

Didn't stop worms
5 1.2%
Didn't prevent heartworm
3 0.7%
Didn't stop fleas
1 0.2%

How soon problems started

Same day
101 27%
1–2 days
90 24%
3–7 days
70 19%
1–4 weeks
49 13%
Over a month
59 16%

Time from the first dose to the first sign, where both dates were reported (369 reports).

How the animals did

Recovered
116 28%
Recovered with lasting effects
5 1.2%
Still unwell when reported
85 20%
Died
87 21%
Euthanised
76 18%
Not known
52 12%

Breeds named most often

Popular breeds appear more often because there are more of them.

Other medicines for dogs