Breathing problems after Imidacloprid + Moxidectin (Advantage Multi) in dogs

The FDA has received 499 reports of breathing problems in dogs after Imidacloprid + Moxidectin. That is 3.8% of all reports for this medicine, compared with 2.7% across reports for all dog medicines.

499Reports
75%Marked serious
42%Recovered
12%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
211 53%
1–2 days
68 17%
3–7 days
38 9.6%
1–4 weeks
43 11%
Over a month
36 9.1%

How the animals did

Recovered
208 42%
Recovered with lasting effects
2 0.4%
Still unwell when reported
25 5.0%
Died
30 6.0%
Euthanised
30 6.0%
Not known
204 41%

Problems reported at the same time

Age of the animals

Under 1 year
53
1–3 years
141
4–7 years
133
8–11 years
98
12+ years
60

About this medicine

Imidacloprid kills fleas (spot-on or collar). Moxidectin prevents heartworm disease (monthly topical, or a 6- or 12-month injection for dogs).

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

Questions owners ask

Can Imidacloprid + Moxidectin cause breathing problems in dogs?
499 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 the same 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).

Breathing problems with similar medicines

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