Didn't prevent heartworm after Butorphanol in dogs

33 reports to the FDA describe didn't prevent heartworm in dogs given Butorphanol. That is 0.7% of all reports for this medicine, compared with 13% across reports for all dog medicines, so it is reported less often than average with this medicine.

33Reports
18%Marked serious
0.0%Recovered
3.0%Died or euthanised
126 daysTypical onset
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How soon it started

Same day
0 0.0%
1–2 days
0 0.0%
3–7 days
0 0.0%
1–4 weeks
1 5.9%
Over a month
16 94%

How the animals did

Still unwell when reported
6 18%
Died
1 3.0%
Not known
26 79%

Problems reported at the same time

Age of the animals

Under 1 year
1
1–3 years
20
4–7 years
10
8–11 years
1
12+ years
1

About this medicine

Type: medicine.

Questions owners ask

Can Butorphanol cause didn't prevent heartworm 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 126 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 prevent heartworm with similar medicines

All reported side effects of Butorphanol in dogs · Medicines most reported with didn't prevent heartworm