Didn't stop worms after Drontal in dogs

The FDA has received 30 reports of didn't stop worms in dogs after Drontal. That is 59% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

30Reports
87%Marked serious
3.3%Recovered
0.0%Died or euthanised
57 daysTypical onset
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How soon it started

Same day
3 12%
1–2 days
0 0.0%
3–7 days
1 4.0%
1–4 weeks
5 20%
Over a month
16 64%

How the animals did

Recovered
1 3.3%
Still unwell when reported
28 93%
Not known
1 3.3%

Problems reported at the same time

Intentional misuse
2 6.7%
Underdose
1 3.3%
Pale mucous membrane
1 3.3%
Unsteady gait
1 3.3%
Vomiting
1 3.3%
Diarrhea
1 3.3%

Age of the animals

Under 1 year
16
1–3 years
10
4–7 years
2
8–11 years
1
12+ years
1

About this medicine

Type: medicine.

Questions owners ask

Can Drontal cause didn't stop worms in dogs?
30 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 57 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).

Didn't stop worms with similar medicines

All reported side effects of Drontal in dogs · Medicines most reported with didn't stop worms