Weight loss after Cephalexin in dogs

The FDA has received 120 reports of weight loss in dogs after Cephalexin. That is 4.5% of all reports for this medicine, compared with 1.7% across reports for all dog medicines, so it is reported unusually often with this medicine.

120Reports
67%Marked serious
13%Recovered
28%Died or euthanised
9 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
16 17%
1–2 days
16 17%
3–7 days
14 15%
1–4 weeks
21 22%
Over a month
27 29%

How the animals did

Recovered
10 8.3%
Recovered with lasting effects
6 5.0%
Still unwell when reported
50 42%
Died
10 8.3%
Euthanised
23 19%
Not known
21 18%

Problems reported at the same time

Age of the animals

Under 1 year
3
1–3 years
18
4–7 years
37
8–11 years
41
12+ years
20

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause weight loss in dogs?
120 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 9 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).

Weight loss with similar medicines

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