Mass after Gabapentin in dogs

The FDA has received 70 reports of mass in dogs after Gabapentin. That is 0.8% 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.

70Reports

69%Marked serious

2.9%Recovered

36%Died or euthanised

22 daysTypical onset

How soon it started

Same day

11 22%

1–2 days

5 9.8%

3–7 days

5 9.8%

1–4 weeks

8 16%

Over a month

22 43%

How the animals did

Recovered

2 2.9%

Still unwell when reported

25 36%

Died

2 2.9%

Euthanised

23 33%

Not known

18 26%

Problems reported at the same time

Liver problems

26 37%

Loss of appetite

25 36%

Didn't work as expected

25 36%

25 36%

20 29%

19 27%

19 27%

17 24%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Gabapentin used for pain and to reduce stress or anxiety.

Questions owners ask

Can Gabapentin cause mass in dogs?: 70 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 22 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 Trazodone 20 reports · 0.8% of its reports

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