Disorientation after Melarsomine (Immiticide) in dogs

The FDA has received 97 reports of disorientation in dogs after Melarsomine. That is 0.4% of all reports for this medicine, compared with 1.0% across reports for all dog medicines, so it is reported less often than average with this medicine.

97Reports
32%Marked serious
18%Recovered
6.2%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
22 48%
1–2 days
3 6.5%
3–7 days
8 17%
1–4 weeks
5 11%
Over a month
8 17%

How the animals did

Recovered
17 18%
Still unwell when reported
16 16%
Died
5 5.2%
Euthanised
1 1.0%
Not known
58 60%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
40
4–7 years
41
8–11 years
6
12+ years
3

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 disorientation in dogs?
97 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).

Disorientation with similar medicines

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