Didn't stop worms after Sulfadimethoxine in dogs

The FDA has received 49 reports of didn't stop worms in dogs after Sulfadimethoxine. That is 5.3% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

49Reports
16%Marked serious
12%Recovered
0.0%Died or euthanised
50 daysTypical onset
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How soon it started

Same day
1 3.2%
1–2 days
1 3.2%
3–7 days
1 3.2%
1–4 weeks
5 16%
Over a month
23 74%

How the animals did

Recovered
6 12%
Still unwell when reported
6 12%
Not known
37 76%

Problems reported at the same time

Didn't work as expected
17 35%
Diarrhea
10 20%
Vomiting
7 14%
Itching
2 4.1%
Blood in faeces
2 4.1%
Loose stool
2 4.1%
Overdose
2 4.1%
Intentional misuse
2 4.1%

Age of the animals

Under 1 year
37
1–3 years
5
4–7 years
4
8–11 years
2
12+ years
0

About this medicine

Type: medicine.

Questions owners ask

Can Sulfadimethoxine cause didn't stop worms in dogs?
49 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 50 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 Sulfadimethoxine in dogs · Medicines most reported with didn't stop worms