Swollen eye after Milbemycin Oxime + Praziquantel (Interceptor Plus) in dogs

33 reports to the FDA describe swollen eye in dogs given Milbemycin Oxime + Praziquantel. That is 0.1% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

33Reports
18%Marked serious
39%Recovered
6.1%Died or euthanised
19 daysTypical onset
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How soon it started

Same day
6 24%
1–2 days
4 16%
3–7 days
1 4.0%
1–4 weeks
3 12%
Over a month
11 44%

How the animals did

Recovered
13 39%
Still unwell when reported
10 30%
Euthanised
2 6.1%
Not known
8 24%

Problems reported at the same time

12 36%
8 24%
Swollen lip
4 12%

Age of the animals

Under 1 year
9
1–3 years
15
4–7 years
7
8–11 years
2
12+ years
0

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 swollen eye in dogs?
33 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 19 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).

Swollen eye with similar medicines

All reported side effects of Milbemycin Oxime + Praziquantel in dogs · Medicines most reported with swollen eye