Hair loss after Cephalexin in dogs

The FDA has received 76 reports of hair loss in dogs after Cephalexin. That is 2.8% of all reports for this medicine, compared with 1.0% across reports for all dog medicines, so it is reported unusually often with this medicine.

76Reports
59%Marked serious
20%Recovered
6.6%Died or euthanised
15 daysTypical onset
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How soon it started

Same day
10 15%
1–2 days
5 7.7%
3–7 days
8 12%
1–4 weeks
23 35%
Over a month
19 29%

How the animals did

Recovered
9 12%
Recovered with lasting effects
6 7.9%
Still unwell when reported
36 47%
Euthanised
5 6.6%
Not known
20 26%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
21
4–7 years
22
8–11 years
20
12+ years
3

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause hair loss in dogs?
76 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 15 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).

Hair loss with similar medicines

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