Vomiting after Cephalexin in cats

62 reports to the FDA describe vomiting in cats given Cephalexin. That is 70% of all reports for this medicine, compared with 18% across reports for all cat medicines, so it is reported unusually often with this medicine.

62Reports
19%Marked serious
48%Recovered
1.6%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
45 83%
1–2 days
3 5.6%
3–7 days
2 3.7%
1–4 weeks
1 1.9%
Over a month
3 5.6%

How the animals did

Recovered
30 48%
Still unwell when reported
1 1.6%
Euthanised
1 1.6%
Not known
30 48%

Problems reported at the same time

27 44%
Loss of appetite
7 11%
Lethargy
7 11%
Kidney problems
6 9.7%
Crystalluria
4 6.5%
Diarrhea
4 6.5%
Decreased urine concentration
3 4.8%

Age of the animals

Under 1 year
13
1–3 years
20
4–7 years
14
8–11 years
10
12+ years
4

About this medicine

Type: medicine.

Questions owners ask

Can Cephalexin cause vomiting in cats?
62 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).

Vomiting with similar medicines

All reported side effects of Cephalexin in cats · Medicines most reported with vomiting