Didn't stop worms after Permethrin + Pyriproxyfen in dogs

45 reports to the FDA describe didn't stop worms in dogs given Permethrin + Pyriproxyfen. That is 9.2% of all reports for this medicine, compared with 8.4% across reports for all dog medicines.

45Reports
13%Marked serious
2.2%Recovered
0.0%Died or euthanised
169 daysTypical onset
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How soon it started

Same day
1 5.6%
1–2 days
0 0.0%
3–7 days
1 5.6%
1–4 weeks
2 11%
Over a month
14 78%

How the animals did

Recovered
1 2.2%
Still unwell when reported
7 16%
Not known
37 82%

Problems reported at the same time

Didn't work as expected
7 16%
Vomiting
5 11%
Diarrhea
5 11%
Loss of appetite
2 4.4%
Weight loss
2 4.4%
Loose stool
2 4.4%
Lethargy
1 2.2%
Adipsia
1 2.2%

Age of the animals

Under 1 year
16
1–3 years
12
4–7 years
11
8–11 years
5
12+ years
1

About this medicine

Type: medicine.

Questions owners ask

Can Permethrin + Pyriproxyfen cause didn't stop worms in dogs?
45 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 169 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).

Didn't stop worms with similar medicines

All reported side effects of Permethrin + Pyriproxyfen in dogs · Medicines most reported with didn't stop worms