Loss of appetite after Ampicillin in cats

The FDA has received 113 reports of loss of appetite in cats after Ampicillin. That is 37% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

113Reports
77%Marked serious
13%Recovered
31%Died or euthanised
2 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
23 24%
1–2 days
33 34%
3–7 days
12 13%
1–4 weeks
16 17%
Over a month
12 13%

How the animals did

Recovered
13 12%
Recovered with lasting effects
2 1.8%
Still unwell when reported
43 38%
Died
8 7.1%
Euthanised
27 24%
Not known
20 18%

Problems reported at the same time

Age of the animals

Under 1 year
11
1–3 years
12
4–7 years
29
8–11 years
27
12+ years
34

About this medicine

Type: medicine.

Questions owners ask

Can Ampicillin cause loss of appetite in cats?
113 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 2 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 cats · Medicines most reported with loss of appetite