Loss of appetite after Thyroxine in dogs

62 reports to the FDA describe loss of appetite in dogs given Thyroxine. That is 20% 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.

62Reports
68%Marked serious
15%Recovered
24%Died or euthanised
52 daysTypical onset
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How soon it started

Same day
4 10%
1–2 days
1 2.5%
3–7 days
3 7.5%
1–4 weeks
9 23%
Over a month
23 57%

How the animals did

Recovered
9 15%
Still unwell when reported
19 31%
Died
4 6.5%
Euthanised
11 18%
Not known
19 31%

Problems reported at the same time

35 56%
33 53%
17 27%
15 24%
Abnormal ultrasound finding
10 16%

Age of the animals

Under 1 year
0
1–3 years
1
4–7 years
3
8–11 years
31
12+ years
27

About this medicine

Type: medicine.

Questions owners ask

Can Thyroxine cause loss of appetite in dogs?
62 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 52 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).

Loss of appetite with similar medicines

All reported side effects of Thyroxine in dogs · Medicines most reported with loss of appetite