Weight loss after Famotidine in cats

58 reports to the FDA describe weight loss in cats given Famotidine. That is 14% of all reports for this medicine, compared with 4.6% across reports for all cat medicines, so it is reported unusually often with this medicine.

58Reports
69%Marked serious
5.2%Recovered
24%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
10 20%
1–2 days
15 29%
3–7 days
8 16%
1–4 weeks
8 16%
Over a month
10 20%

How the animals did

Recovered
3 5.2%
Still unwell when reported
24 41%
Died
4 6.9%
Euthanised
10 17%
Not known
17 29%

Problems reported at the same time

Age of the animals

Under 1 year
5
1–3 years
9
4–7 years
6
8–11 years
12
12+ years
25

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause weight loss in cats?
58 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).

Weight loss with similar medicines

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