Itching after Moxidectin + Pyrantel + Sarolaner (Simparica Trio) in dogs

57 reports to the FDA describe itching in dogs given Moxidectin + Pyrantel + Sarolaner. That is 4.9% of all reports for this medicine, compared with 4.3% across reports for all dog medicines.

57Reports
25%Marked serious
25%Recovered
0.0%Died or euthanised
31 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
3 7.1%
1–2 days
3 7.1%
3–7 days
2 4.8%
1–4 weeks
12 29%
Over a month
22 52%

How the animals did

Recovered
12 21%
Recovered with lasting effects
2 3.5%
Still unwell when reported
20 35%
Not known
23 40%

Problems reported at the same time

12 21%
Hair loss
11 19%
Skin rash or irritation
8 14%
Otitis externa
6 11%

Age of the animals

Under 1 year
7
1–3 years
18
4–7 years
15
8–11 years
12
12+ years
2

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 itching in dogs?
57 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 31 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).

Itching with similar medicines

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