Diarrhea after Heartgard in dogs

23 reports to the FDA describe diarrhea in dogs given Heartgard. That is 6.1% of all reports for this medicine, compared with 8.4% across reports for all dog medicines.

23Reports
74%Marked serious
13%Recovered
13%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
2 13%
1–2 days
4 27%
3–7 days
3 20%
1–4 weeks
3 20%
Over a month
3 20%

How the animals did

Recovered
3 13%
Still unwell when reported
14 61%
Euthanised
3 13%
Not known
3 13%

Problems reported at the same time

Weight loss
5 22%
Death
3 13%
Excessive thirst
3 13%
Urinary tract infection
3 13%
Inappropriate urination
3 13%

Age of the animals

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

About this medicine

Type: medicine.

Questions owners ask

Can Heartgard cause diarrhea in dogs?
23 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 3 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).

Diarrhea with similar medicines

All reported side effects of Heartgard in dogs · Medicines most reported with diarrhea