Mass after Famotidine in dogs

24 reports to the FDA describe mass in dogs given Famotidine. That is 0.9% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

24Reports

54%Marked serious

4.2%Recovered

25%Died or euthanised

4 daysTypical onset

How soon it started

Same day

3 16%

1–2 days

2 11%

3–7 days

5 26%

1–4 weeks

4 21%

Over a month

5 26%

How the animals did

Recovered

1 4.2%

Still unwell when reported

1 4.2%

Euthanised

6 25%

Not known

16 67%

Problems reported at the same time

Swelling

16 67%

Didn't work as expected

16 67%

Injection site reaction

12 50%

8 33%

7 29%

7 29%

6 25%

6 25%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: medicine.

Questions owners ask

Can Famotidine cause mass in dogs?: 24 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).

Mass with similar medicines

Mass after Diphenhydramine 29 reports · 0.6% of its reports
Mass after Butorphanol 32 reports · 0.7% of its reports
Mass after Atipamezole 20 reports · 0.8% of its reports
Mass after Tigilanol Tiglate 42 reports · 2.1% of its reports

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