Tremors after Cephalexin in dogs

The FDA has received 128 reports of tremors in dogs after Cephalexin. That is 4.8% of all reports for this medicine, compared with 3.4% across reports for all dog medicines.

128Reports
51%Marked serious
41%Recovered
13%Died or euthanised
6 daysTypical onset
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How soon it started

Same day
22 21%
1–2 days
17 16%
3–7 days
19 18%
1–4 weeks
17 16%
Over a month
29 28%

How the animals did

Recovered
45 35%
Recovered with lasting effects
8 6.3%
Still unwell when reported
39 30%
Died
9 7.0%
Euthanised
8 6.3%
Not known
19 15%

Problems reported at the same time

Age of the animals

Under 1 year
21
1–3 years
33
4–7 years
34
8–11 years
26
12+ years
13

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause tremors in dogs?
128 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 6 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).

Tremors with similar medicines

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