Breathing problems after Moxidectin + Pyrantel + Sarolaner (Simparica Trio) in dogs

40 reports to the FDA describe breathing problems in dogs given Moxidectin + Pyrantel + Sarolaner. That is 3.4% of all reports for this medicine, compared with 2.7% across reports for all dog medicines.

40Reports
53%Marked serious
28%Recovered
28%Died or euthanised
39 daysTypical onset
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How soon it started

Same day
5 21%
1–2 days
2 8.3%
3–7 days
0 0.0%
1–4 weeks
5 21%
Over a month
12 50%

How the animals did

Recovered
10 25%
Recovered with lasting effects
1 2.5%
Still unwell when reported
9 23%
Died
7 18%
Euthanised
4 10%
Not known
9 23%

Problems reported at the same time

Age of the animals

Under 1 year
4
1–3 years
6
4–7 years
8
8–11 years
17
12+ years
5

About this medicine

Moxidectin prevents heartworm disease (monthly topical, or a 6- or 12-month injection for dogs). Pyrantel treats roundworms and hookworms. Sarolaner kills fleas, ticks and some mites; monthly.

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

Some herding breeds (for example Collies) carry the MDR1 gene variant and can be more sensitive to this drug class at high doses.

Questions owners ask

Can Moxidectin + Pyrantel + Sarolaner cause breathing problems in dogs?
40 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 39 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).

Breathing problems with similar medicines

All reported side effects of Moxidectin + Pyrantel + Sarolaner in dogs · Medicines most reported with breathing problems