Loss of appetite after Pyrantel in cats

125 reports to the FDA describe loss of appetite in cats given Pyrantel. That is 22% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

125Reports
41%Marked serious
18%Recovered
22%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
20 24%
1–2 days
25 30%
3–7 days
13 16%
1–4 weeks
16 20%
Over a month
8 9.8%

How the animals did

Recovered
21 17%
Recovered with lasting effects
2 1.6%
Still unwell when reported
33 26%
Died
22 18%
Euthanised
5 4.0%
Not known
42 34%

Problems reported at the same time

Age of the animals

Under 1 year
97
1–3 years
10
4–7 years
7
8–11 years
5
12+ years
5

About this medicine

Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Pyrantel cause loss of appetite in cats?
125 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 1 day 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 Pyrantel in cats · Medicines most reported with loss of appetite