Excessive thirst after Melatonin in dogs

24 reports to the FDA describe excessive thirst in dogs given Melatonin. That is 9.4% 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.

24Reports
58%Marked serious
13%Recovered
13%Died or euthanised
31 daysTypical onset
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How soon it started

Same day
5 29%
1–2 days
0 0.0%
3–7 days
0 0.0%
1–4 weeks
3 18%
Over a month
9 53%

How the animals did

Recovered
3 13%
Still unwell when reported
7 29%
Euthanised
3 13%
Not known
11 46%

Problems reported at the same time

Excessive urination
18 75%
Behaviour change
4 17%
Urine abnormalities
4 17%
Hair loss
4 17%
3 13%

Age of the animals

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

About this medicine

Type: medicine.

Questions owners ask

Can Melatonin cause excessive thirst in dogs?
24 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 31 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 Melatonin in dogs · Medicines most reported with excessive thirst