Allergic reaction after Lotilaner + Moxidectin + Praziquantel + Pyrantel (Credelio Quattro) in dogs

56 reports to the FDA describe allergic reaction in dogs given Lotilaner + Moxidectin + Praziquantel + Pyrantel. That is 1.8% of all reports for this medicine, compared with 2.3% across reports for all dog medicines.

56Reports
21%Marked serious
46%Recovered
3.6%Died or euthanised
6 daysTypical onset
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How soon it started

Same day
12 24%
1–2 days
11 22%
3–7 days
5 10%
1–4 weeks
5 10%
Over a month
16 33%

How the animals did

Recovered
26 46%
Still unwell when reported
14 25%
Died
2 3.6%
Not known
14 25%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
26
4–7 years
11
8–11 years
5
12+ years
4

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 allergic reaction in dogs?
56 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 6 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).

Allergic reaction with similar medicines

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