Loss of appetite after Ampicillin in dogs

380 reports to the FDA describe loss of appetite in dogs given Ampicillin. That is 39% 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.

380Reports
79%Marked serious
9.7%Recovered
47%Died or euthanised
6 daysTypical onset
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How soon it started

Same day
51 16%
1–2 days
59 19%
3–7 days
60 19%
1–4 weeks
85 27%
Over a month
63 20%

How the animals did

Recovered
37 9.7%
Still unwell when reported
118 31%
Died
56 15%
Euthanised
123 32%
Not known
46 12%

Problems reported at the same time

Age of the animals

Under 1 year
48
1–3 years
60
4–7 years
103
8–11 years
112
12+ years
52

About this medicine

Type: medicine.

Questions owners ask

Can Ampicillin cause loss of appetite in dogs?
380 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).

Loss of appetite with similar medicines

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