Excessive thirst after Melarsomine (Immiticide) in dogs

The FDA has received 180 reports of excessive thirst in dogs after Melarsomine. That is 0.8% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

180Reports
38%Marked serious
5.6%Recovered
9.4%Died or euthanised
7 daysTypical onset
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How soon it started

Same day
16 19%
1–2 days
13 15%
3–7 days
15 17%
1–4 weeks
18 21%
Over a month
24 28%

How the animals did

Recovered
7 3.9%
Recovered with lasting effects
3 1.7%
Still unwell when reported
36 20%
Died
12 6.7%
Euthanised
5 2.8%
Not known
117 65%

Problems reported at the same time

Age of the animals

Under 1 year
2
1–3 years
70
4–7 years
73
8–11 years
27
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 excessive thirst in dogs?
180 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 7 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).

Excessive thirst with similar medicines

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