Loose stool after Lotilaner + Moxidectin + Praziquantel + Pyrantel (Credelio Quattro) in dogs

The FDA has received 62 reports of loose stool in dogs after Lotilaner + Moxidectin + Praziquantel + Pyrantel. That is 2.0% of all reports for this medicine, compared with 0.9% across reports for all dog medicines, so it is reported unusually often with this medicine.

62Reports
8.1%Marked serious
48%Recovered
0.0%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
24 42%
1–2 days
9 16%
3–7 days
2 3.5%
1–4 weeks
5 8.8%
Over a month
17 30%

How the animals did

Recovered
30 48%
Still unwell when reported
19 31%
Not known
13 21%

Problems reported at the same time

Age of the animals

Under 1 year
13
1–3 years
20
4–7 years
16
8–11 years
5
12+ years
6

About this medicine

Lotilaner kills fleas and ticks; monthly chewable. Moxidectin prevents heartworm disease (monthly topical, or a 6- or 12-month injection for dogs). Praziquantel treats tapeworms. Pyrantel treats roundworms and hookworms.

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

In 2018 the FDA alerted owners and vets that isoxazoline products have been associated with neurologic reactions such as muscle tremors, wobbliness (ataxia) and seizures, including in animals with no history of them.

Questions owners ask

Can Lotilaner + Moxidectin + Praziquantel + Pyrantel cause loose stool in dogs?
62 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).

Loose stool with similar medicines

All reported side effects of Lotilaner + Moxidectin + Praziquantel + Pyrantel in dogs · Medicines most reported with loose stool