Proprioception abnormality after Moxidectin (ProHeart 6) in dogs

The FDA has received 57 reports of proprioception abnormality in dogs after Moxidectin. That is 0.1% of all reports for this medicine, compared with 0.1% across reports for all dog medicines.

57Reports
7.0%Marked serious
1.8%Recovered
28%Died or euthanised
–Typical onset
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How the animals did

Recovered
1 1.8%
Still unwell when reported
4 7.0%
Died
16 28%
Not known
36 63%

Problems reported at the same time

Age of the animals

Under 1 year
0
1–3 years
16
4–7 years
17
8–11 years
15
12+ years
8

About this medicine

Moxidectin prevents heartworm disease (monthly topical, or a 6- or 12-month injection for dogs).

Products with this ingredient include ProHeart 6, ProHeart 12. 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 cause proprioception abnormality 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.
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).

Proprioception abnormality with similar medicines

All reported side effects of Moxidectin in dogs · Medicines most reported with proprioception abnormality