Hypothyroidism after Imidacloprid + Moxidectin (Advantage Multi) in dogs

The FDA has received 28 reports of hypothyroidism in dogs after Imidacloprid + Moxidectin. That is 0.2% of all reports for this medicine, compared with 0.2% across reports for all dog medicines.

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How soon it started

How the animals did

Problems reported at the same time

Age of the animals

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 hypothyroidism in dogs?

28 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 28 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).

Hypothyroidism with similar medicines

• Hypothyroidism after Spinosad (Comfortis) 63 reports · 0.1% of its reports
• Hypothyroidism after Lufenuron + Milbemycin Oxime (Sentinel) 26 reports · 0.1% of its reports

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