Loss of appetite after Penicillin in dogs

80 reports to the FDA describe loss of appetite in dogs given Penicillin. That is 32% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

80Reports
75%Marked serious
24%Recovered
35%Died or euthanised
4 daysTypical onset
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How soon it started

Same day
19 28%
1–2 days
11 16%
3–7 days
9 13%
1–4 weeks
20 29%
Over a month
9 13%

How the animals did

Recovered
19 24%
Still unwell when reported
24 30%
Died
13 16%
Euthanised
15 19%
Not known
9 11%

Problems reported at the same time

Age of the animals

Under 1 year
7
1–3 years
16
4–7 years
24
8–11 years
27
12+ years
5

About this medicine

Type: medicine.

Questions owners ask

Can Penicillin cause loss of appetite in dogs?
80 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).

Loss of appetite with similar medicines

All reported side effects of Penicillin in dogs · Medicines most reported with loss of appetite