Stiffness after Melarsomine (Immiticide) in dogs

35 reports to the FDA describe stiffness in dogs given Melarsomine. That is 0.2% of all reports for this medicine, compared with 0.2% across reports for all dog medicines.

35Reports

83%Marked serious

31%Recovered

11%Died or euthanised

1 daysTypical onset

How soon it started

Same day

12 38%

1–2 days

7 22%

3–7 days

2 6.3%

1–4 weeks

7 22%

Over a month

4 13%

How the animals did

Recovered

11 31%

Still unwell when reported

10 29%

Died

1 2.9%

Euthanised

3 8.6%

Not known

10 29%

Problems reported at the same time

11 31%

8 23%

7 20%

6 17%

6 17%

Injection site reaction

5 14%

Death

4 11%

Blood problems

4 11%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

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 stiffness in dogs?: 35 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).

Stiffness with similar medicines

Stiffness after Polysulfated Glycosaminoglycan 28 reports · 0.5% of its reports

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