Weight loss after Melarsomine (Immiticide) in dogs

The FDA has received 519 reports of weight loss in dogs after Melarsomine. That is 2.3% of all reports for this medicine, compared with 1.7% across reports for all dog medicines.

519Reports
40%Marked serious
6.6%Recovered
7.7%Died or euthanised
23 daysTypical onset
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How soon it started

Same day
33 13%
1–2 days
30 11%
3–7 days
32 12%
1–4 weeks
57 22%
Over a month
110 42%

How the animals did

Recovered
17 3.3%
Recovered with lasting effects
17 3.3%
Still unwell when reported
135 26%
Died
29 5.6%
Euthanised
11 2.1%
Not known
310 60%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
191
4–7 years
203
8–11 years
87
12+ years
19

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 weight loss in dogs?
519 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 23 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).

Weight loss with similar medicines

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