Tablets, abnormal after Milbemycin Oxime + Praziquantel (Interceptor Plus) in dogs

The FDA has received 21 reports of tablets, abnormal in dogs after Milbemycin Oxime + Praziquantel. That is 0.1% of all reports for this medicine, compared with 0.1% across reports for all dog medicines.

21Reports
14%Marked serious
24%Recovered
4.8%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
13 72%
1–2 days
0 0.0%
3–7 days
1 5.6%
1–4 weeks
1 5.6%
Over a month
3 17%

How the animals did

Recovered
5 24%
Still unwell when reported
5 24%
Died
1 4.8%
Not known
10 48%

Problems reported at the same time

1 4.8%
1 4.8%
Asphyxia
1 4.8%
Appetite disorder
1 4.8%

Age of the animals

Under 1 year
1
1–3 years
4
4–7 years
8
8–11 years
2
12+ years
2

About this medicine

Milbemycin Oxime prevents heartworm and controls some intestinal worms (monthly). Praziquantel treats tapeworms.

Products with this combination include Interceptor Plus. 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 Milbemycin Oxime + Praziquantel cause tablets, abnormal in dogs?
21 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).

Tablets, abnormal with similar medicines

All reported side effects of Milbemycin Oxime + Praziquantel in dogs · Medicines most reported with tablets, abnormal