Diarrhea after Famotidine in cats

49 reports to the FDA describe diarrhea in cats given Famotidine. That is 12% of all reports for this medicine, compared with 5.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

49Reports
61%Marked serious
12%Recovered
8.2%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
10 23%
1–2 days
15 35%
3–7 days
9 21%
1–4 weeks
4 9.3%
Over a month
5 12%

How the animals did

Recovered
5 10%
Recovered with lasting effects
1 2.0%
Still unwell when reported
29 59%
Died
1 2.0%
Euthanised
3 6.1%
Not known
10 20%

Problems reported at the same time

20 41%
11 22%
Medication error
8 16%

Age of the animals

Under 1 year
7
1–3 years
8
4–7 years
2
8–11 years
10
12+ years
22

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause diarrhea in cats?
49 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 1 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).

Diarrhea with similar medicines

All reported side effects of Famotidine in cats · Medicines most reported with diarrhea