Weight loss after Ampicillin in dogs

81 reports to the FDA describe weight loss in dogs given Ampicillin. That is 8.3% 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.

81Reports
79%Marked serious
14%Recovered
49%Died or euthanised
9 daysTypical onset
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How soon it started

Same day
7 11%
1–2 days
8 12%
3–7 days
16 25%
1–4 weeks
19 29%
Over a month
15 23%

How the animals did

Recovered
11 14%
Still unwell when reported
22 27%
Died
6 7.4%
Euthanised
34 42%
Not known
8 9.9%

Problems reported at the same time

Age of the animals

Under 1 year
8
1–3 years
11
4–7 years
23
8–11 years
24
12+ years
15

About this medicine

Type: medicine.

Questions owners ask

Can Ampicillin cause weight loss in dogs?
81 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 9 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 Ampicillin in dogs · Medicines most reported with weight loss