Excessive thirst after Thyroxine in dogs

25 reports to the FDA describe excessive thirst in dogs given Thyroxine. That is 8.2% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

25Reports
44%Marked serious
12%Recovered
4.0%Died or euthanised
105 daysTypical onset
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How soon it started

Same day
1 5.0%
1–2 days
1 5.0%
3–7 days
1 5.0%
1–4 weeks
4 20%
Over a month
13 65%

How the animals did

Recovered
3 12%
Still unwell when reported
18 72%
Euthanised
1 4.0%
Not known
3 12%

Problems reported at the same time

Excessive urination
19 76%
Decreased urine concentration
4 16%
Urinary tract infection
4 16%

Age of the animals

Under 1 year
0
1–3 years
0
4–7 years
0
8–11 years
11
12+ years
14

About this medicine

Type: medicine.

Questions owners ask

Can Thyroxine cause excessive thirst in dogs?
25 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 105 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).

Excessive thirst with similar medicines

All reported side effects of Thyroxine in dogs · Medicines most reported with excessive thirst