Weight loss after Phenobarbital in dogs

The FDA has received 48 reports of weight loss in dogs after Phenobarbital. That is 3.1% of all reports for this medicine, compared with 1.7% across reports for all dog medicines, so it is reported unusually often with this medicine.

48Reports
75%Marked serious
15%Recovered
31%Died or euthanised
24 daysTypical onset
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How soon it started

Same day
5 19%
1–2 days
2 7.7%
3–7 days
3 12%
1–4 weeks
6 23%
Over a month
10 38%

How the animals did

Recovered
5 10%
Recovered with lasting effects
2 4.2%
Still unwell when reported
17 35%
Died
4 8.3%
Euthanised
11 23%
Not known
9 19%

Problems reported at the same time

Age of the animals

Under 1 year
0
1–3 years
3
4–7 years
9
8–11 years
19
12+ years
15

About this medicine

Type: medicine.

Questions owners ask

Can Phenobarbital cause weight loss in dogs?
48 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 24 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 Phenobarbital in dogs · Medicines most reported with weight loss