Lethargy after Famotidine in dogs

785 reports to the FDA describe lethargy in dogs given Famotidine. That is 30% of all reports for this medicine, compared with 11% across reports for all dog medicines, so it is reported unusually often with this medicine.

785Reports
66%Marked serious
18%Recovered
33%Died or euthanised
4 daysTypical onset
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How soon it started

Same day
177 27%
1–2 days
90 14%
3–7 days
115 18%
1–4 weeks
133 20%
Over a month
136 21%

How the animals did

Recovered
133 17%
Recovered with lasting effects
10 1.3%
Still unwell when reported
277 35%
Died
98 12%
Euthanised
162 21%
Not known
105 13%

Problems reported at the same time

Age of the animals

Under 1 year
54
1–3 years
147
4–7 years
207
8–11 years
242
12+ years
129

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause lethargy in dogs?
785 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 4 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).

Lethargy with similar medicines

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