Excessive thirst after Cephalexin in dogs

The FDA has received 61 reports of excessive thirst in dogs after Cephalexin. That is 2.3% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

61Reports
57%Marked serious
16%Recovered
15%Died or euthanised
18 daysTypical onset
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How soon it started

Same day
6 13%
1–2 days
11 23%
3–7 days
2 4.2%
1–4 weeks
8 17%
Over a month
21 44%

How the animals did

Recovered
8 13%
Recovered with lasting effects
2 3.3%
Still unwell when reported
28 46%
Died
5 8.2%
Euthanised
4 6.6%
Not known
14 23%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
9
4–7 years
14
8–11 years
26
12+ years
10

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause excessive thirst in dogs?
61 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).

Excessive thirst with similar medicines

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