Leucocytosis after Famotidine in dogs

The FDA has received 191 reports of leucocytosis in dogs after Famotidine. That is 7.2% of all reports for this medicine, compared with 1.0% across reports for all dog medicines, so it is reported unusually often with this medicine.

191Reports
83%Marked serious
6.8%Recovered
59%Died or euthanised
6 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
26 15%
1–2 days
28 16%
3–7 days
39 23%
1–4 weeks
50 29%
Over a month
30 17%

How the animals did

Recovered
13 6.8%
Still unwell when reported
53 28%
Died
39 20%
Euthanised
73 38%
Not known
13 6.8%

Problems reported at the same time

Age of the animals

Under 1 year
19
1–3 years
29
4–7 years
50
8–11 years
68
12+ years
25

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause leucocytosis in dogs?
191 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 6 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).

Leucocytosis with similar medicines

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