Overdose after Cephalexin in dogs

The FDA has received 189 reports of overdose in dogs after Cephalexin. That is 7.1% of all reports for this medicine, compared with 1.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

189Reports
15%Marked serious
31%Recovered
0.5%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
105 81%
1–2 days
10 7.8%
3–7 days
7 5.4%
1–4 weeks
4 3.1%
Over a month
3 2.3%

How the animals did

Recovered
59 31%
Still unwell when reported
18 9.5%
Died
1 0.5%
Not known
111 59%

Problems reported at the same time

Age of the animals

Under 1 year
15
1–3 years
73
4–7 years
54
8–11 years
36
12+ years
8

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause overdose in dogs?
189 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).

Overdose with similar medicines

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