Digestive tract disorder after Ivermectin + Praziquantel + Pyrantel (Iverhart Max) in dogs

The FDA has received 61 reports of digestive tract disorder in dogs after Ivermectin + Praziquantel + Pyrantel. That is 0.7% of all reports for this medicine, compared with 2.0% across reports for all dog medicines, so it is reported less often than average with this medicine.

61Reports

11%Marked serious

31%Recovered

1.6%Died or euthanised

Same dayTypical onset

How soon it started

Same day

18 53%

1–2 days

7 21%

3–7 days

3 8.8%

1–4 weeks

4 12%

Over a month

2 5.9%

How the animals did

Recovered

19 31%

Still unwell when reported

2 3.3%

Died

1 1.6%

Not known

39 64%

Problems reported at the same time

38 62%

15 25%

11 18%

5 8.2%

5 8.2%

5 8.2%

Didn't work as expected

5 8.2%

Behaviour change

5 8.2%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Ivermectin prevents heartworm disease (monthly). Praziquantel treats tapeworms. Pyrantel treats roundworms and hookworms.

Products with this combination include Iverhart Max. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Some herding breeds (for example Collies) carry the MDR1 gene variant and can be more sensitive to this drug class at high doses.

Questions owners ask

Can Ivermectin + Praziquantel + Pyrantel cause digestive tract disorder in dogs?: 61 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 the same 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).

Digestive tract disorder with similar medicines

Digestive tract disorder after Ivermectin + Pyrantel (Heartgard Plus) 16,532 reports · 11% of its reports
Digestive tract disorder after Milbemycin Oxime + Spinosad (Trifexis) 487 reports · 0.4% of its reports
Digestive tract disorder after Moxidectin (ProHeart 6) 88 reports · 0.2% of its reports
Digestive tract disorder after Milbemycin Oxime + Praziquantel (Interceptor Plus) 123 reports · 0.4% of its reports
Digestive tract disorder after Milbemycin Oxime (Interceptor) 178 reports · 0.6% of its reports
Digestive tract disorder after Selamectin (Revolution) 75 reports · 0.3% of its reports
Digestive tract disorder after Ivermectin (Heartgard) 63 reports · 0.5% of its reports

All reported side effects of Ivermectin + Praziquantel + Pyrantel in dogs · Medicines most reported with digestive tract disorder