Hair loss after Melarsomine (Immiticide) in dogs

The FDA has received 217 reports of hair loss in dogs after Melarsomine. That is 1.0% of all reports for this medicine, compared with 1.0% across reports for all dog medicines.

217Reports
35%Marked serious
1.8%Recovered
4.6%Died or euthanised
30 daysTypical onset
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How soon it started

Same day
21 14%
1–2 days
6 4.0%
3–7 days
14 9.3%
1–4 weeks
35 23%
Over a month
74 49%

How the animals did

Recovered
3 1.4%
Recovered with lasting effects
1 0.5%
Still unwell when reported
64 29%
Died
5 2.3%
Euthanised
5 2.3%
Not known
139 64%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
99
4–7 years
74
8–11 years
32
12+ years
6

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 hair loss in dogs?
217 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 30 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).

Hair loss with similar medicines

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