Diarrhea after Cephalexin in dogs

The FDA has received 238 reports of diarrhea in dogs after Cephalexin. That is 8.9% of all reports for this medicine, compared with 8.4% across reports for all dog medicines.

238Reports
57%Marked serious
28%Recovered
18%Died or euthanised
5 daysTypical onset
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How soon it started

Same day
48 24%
1–2 days
32 16%
3–7 days
31 16%
1–4 weeks
36 18%
Over a month
49 25%

How the animals did

Recovered
58 24%
Recovered with lasting effects
8 3.4%
Still unwell when reported
77 32%
Died
24 10%
Euthanised
19 8.0%
Not known
52 22%

Problems reported at the same time

Age of the animals

Under 1 year
18
1–3 years
65
4–7 years
60
8–11 years
66
12+ years
27

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause diarrhea in dogs?
238 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 5 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).

Diarrhea with similar medicines

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