Behaviour change after Famotidine in cats

The FDA has received 44 reports of behaviour change in cats after Famotidine. That is 11% of all reports for this medicine, compared with 5.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

44Reports
61%Marked serious
20%Recovered
32%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
15 37%
1–2 days
12 29%
3–7 days
4 9.8%
1–4 weeks
6 15%
Over a month
4 9.8%

How the animals did

Recovered
9 20%
Still unwell when reported
10 23%
Died
5 11%
Euthanised
9 20%
Not known
11 25%

Problems reported at the same time

Age of the animals

Under 1 year
3
1–3 years
6
4–7 years
6
8–11 years
8
12+ years
20

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause behaviour change in cats?
44 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).

Behaviour change with similar medicines

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