Loss of appetite after Pyrantel in dogs

The FDA has received 621 reports of loss of appetite in dogs after Pyrantel. That is 13% 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.

621Reports
35%Marked serious
11%Recovered
29%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
110 35%
1–2 days
85 27%
3–7 days
35 11%
1–4 weeks
51 16%
Over a month
29 9.4%

How the animals did

Recovered
62 10.0%
Recovered with lasting effects
8 1.3%
Still unwell when reported
118 19%
Died
143 23%
Euthanised
36 5.8%
Not known
254 41%

Problems reported at the same time

336 54%
289 47%
232 37%
176 28%
75 12%

Age of the animals

Under 1 year
369
1–3 years
89
4–7 years
56
8–11 years
46
12+ years
21

About this medicine

Pyrantel treats roundworms and hookworms.

Questions owners ask

Can Pyrantel cause loss of appetite in dogs?
621 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 dogs · Medicines most reported with loss of appetite