Blood problems after Famotidine in cats

The FDA has received 46 reports of blood problems in cats after Famotidine. That is 11% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

46Reports
78%Marked serious
13%Recovered
35%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
9 21%
1–2 days
10 23%
3–7 days
8 19%
1–4 weeks
12 28%
Over a month
4 9.3%

How the animals did

Recovered
6 13%
Still unwell when reported
17 37%
Died
3 6.5%
Euthanised
13 28%
Not known
7 15%

Problems reported at the same time

18 39%
16 35%
Pale mucous membrane
11 24%

Age of the animals

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

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause blood problems in cats?
46 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 3 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).

Blood problems with similar medicines

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