Underdose after Pyrantel + Sarolaner (Simparica Trio) in dogs

216 reports to the FDA describe underdose in dogs given Pyrantel + Sarolaner. That is 0.4% of all reports for this medicine, compared with 1.0% across reports for all dog medicines, so it is reported less often than average with this medicine.

216Reports
61%Marked serious
13%Recovered
2.3%Died or euthanised
15 daysTypical onset
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How soon it started

Same day
52 35%
1–2 days
6 4.0%
3–7 days
7 4.7%
1–4 weeks
19 13%
Over a month
65 44%

How the animals did

Recovered
27 13%
Still unwell when reported
153 71%
Euthanised
5 2.3%
Not known
31 14%

Problems reported at the same time

Age of the animals

Under 1 year
23
1–3 years
101
4–7 years
54
8–11 years
22
12+ years
9

About this medicine

Pyrantel treats roundworms and hookworms. Sarolaner kills fleas, ticks and some mites; monthly.

Products with this combination include Simparica Trio (which also contains moxidectin). The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Questions owners ask

Can Pyrantel + Sarolaner cause underdose in dogs?
216 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 15 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).

Underdose with similar medicines

All reported side effects of Pyrantel + Sarolaner in dogs · Medicines most reported with underdose