Neutrophilia after Cephalexin in dogs

The FDA has received 54 reports of neutrophilia in dogs after Cephalexin. That is 2.0% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported unusually often with this medicine.

54Reports
76%Marked serious
13%Recovered
33%Died or euthanised
7 daysTypical onset
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How soon it started

Same day
5 12%
1–2 days
9 21%
3–7 days
9 21%
1–4 weeks
8 19%
Over a month
12 28%

How the animals did

Recovered
7 13%
Still unwell when reported
19 35%
Died
8 15%
Euthanised
10 19%
Not known
10 19%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
11
4–7 years
15
8–11 years
19
12+ years
7

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause neutrophilia in dogs?
54 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 7 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).

Neutrophilia with similar medicines

All reported side effects of Cephalexin in dogs · Medicines most reported with neutrophilia