Allergic reaction after Melarsomine (Immiticide) in dogs

1,008 reports to the FDA describe allergic reaction in dogs given Melarsomine. That is 4.4% of all reports for this medicine, compared with 2.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

1,008Reports
52%Marked serious
19%Recovered
3.8%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
311 49%
1–2 days
26 4.1%
3–7 days
33 5.2%
1–4 weeks
114 18%
Over a month
148 23%

How the animals did

Recovered
195 19%
Recovered with lasting effects
1 0.1%
Still unwell when reported
312 31%
Died
34 3.4%
Euthanised
4 0.4%
Not known
462 46%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
530
4–7 years
333
8–11 years
91
12+ years
9

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 allergic reaction in dogs?
1,008 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).

Allergic reaction with similar medicines

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