Behaviour change after Melarsomine (Immiticide) in dogs

278 reports to the FDA describe behaviour change in dogs given Melarsomine. That is 1.2% of all reports for this medicine, compared with 2.5% across reports for all dog medicines, so it is reported less often than average with this medicine.

278Reports
46%Marked serious
13%Recovered
10%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
71 40%
1–2 days
22 12%
3–7 days
17 9.6%
1–4 weeks
23 13%
Over a month
44 25%

How the animals did

Recovered
36 13%
Still unwell when reported
59 21%
Died
23 8.3%
Euthanised
6 2.2%
Not known
154 55%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
155
4–7 years
87
8–11 years
17
12+ years
5

About this medicine

Melarsomine treats adult heartworm infection (a series of injections given by a vet).

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

Questions owners ask

Can Melarsomine cause behaviour change in dogs?
278 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 1 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).

Behaviour change with similar medicines

All reported side effects of Melarsomine in dogs · Medicines most reported with behaviour change