Lethargy after Famotidine in cats

The FDA has received 106 reports of lethargy in cats after Famotidine. That is 26% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

106Reports
62%Marked serious
16%Recovered
34%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
31 30%
1–2 days
27 26%
3–7 days
21 21%
1–4 weeks
14 14%
Over a month
9 8.8%

How the animals did

Recovered
17 16%
Still unwell when reported
39 37%
Died
11 10%
Euthanised
25 24%
Not known
14 13%

Problems reported at the same time

Age of the animals

Under 1 year
10
1–3 years
23
4–7 years
18
8–11 years
23
12+ years
32

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause lethargy in cats?
106 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).

Lethargy with similar medicines

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