Didn't work as expected after Thyroxine in dogs

35 reports to the FDA describe didn't work as expected in dogs given Thyroxine. That is 11% of all reports for this medicine, compared with 13% across reports for all dog medicines.

35Reports
40%Marked serious
8.6%Recovered
5.7%Died or euthanised
32 daysTypical onset
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How soon it started

Same day
4 20%
1–2 days
0 0.0%
3–7 days
1 5.0%
1–4 weeks
4 20%
Over a month
11 55%

How the animals did

Recovered
3 8.6%
Still unwell when reported
19 54%
Euthanised
2 5.7%
Not known
11 31%

Problems reported at the same time

Hypothyroidism
3 8.6%
3 8.6%
Wobbliness (ataxia)
3 8.6%

Age of the animals

Under 1 year
0
1–3 years
0
4–7 years
6
8–11 years
15
12+ years
13

About this medicine

Type: medicine.

Questions owners ask

Can Thyroxine cause didn't work as expected in dogs?
35 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 32 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 work as expected with similar medicines

All reported side effects of Thyroxine in dogs · Medicines most reported with didn't work as expected