Dermal mass after Cephalexin in dogs

The FDA has received 26 reports of dermal mass in dogs after Cephalexin. That is 1.0% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

26Reports

62%Marked serious

12%Recovered

19%Died or euthanised

18 daysTypical onset

How soon it started

Same day

1 5.3%

1–2 days

1 5.3%

3–7 days

2 11%

1–4 weeks

8 42%

Over a month

7 37%

How the animals did

Recovered

3 12%

Still unwell when reported

15 58%

Died

3 12%

Euthanised

2 7.7%

Not known

3 12%

Problems reported at the same time

6 23%

6 23%

5 19%

5 19%

5 19%

4 15%

Skin and/or appendage neoplasm

4 15%

Liver problems

4 15%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause dermal mass in dogs?: 26 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 18 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).

Dermal mass with similar medicines

Dermal mass after Diphenhydramine 26 reports · 0.6% of its reports
Dermal mass after Cefpodoxime 41 reports · 1.0% of its reports
Dermal mass after Tramadol 23 reports · 0.6% of its reports

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