Discomfort after Melarsomine (Immiticide) in dogs

The FDA has received 68 reports of discomfort in dogs after Melarsomine. That is 0.3% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

68Reports
44%Marked serious
24%Recovered
4.4%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
38 59%
1–2 days
6 9.4%
3–7 days
1 1.6%
1–4 weeks
10 16%
Over a month
9 14%

How the animals did

Recovered
16 24%
Still unwell when reported
36 53%
Died
1 1.5%
Euthanised
2 2.9%
Not known
13 19%

Problems reported at the same time

Age of the animals

Under 1 year
0
1–3 years
33
4–7 years
26
8–11 years
4
12+ years
1

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 discomfort in dogs?
68 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).

Discomfort with similar medicines

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