Lethargy after Theophylline in dogs

39 reports to the FDA describe lethargy in dogs given Theophylline. That is 22% of all reports for this medicine, compared with 11% across reports for all dog medicines, so it is reported unusually often with this medicine.

39Reports
64%Marked serious
26%Recovered
26%Died or euthanised
28 daysTypical onset
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How soon it started

Same day
5 23%
1–2 days
5 23%
3–7 days
0 0.0%
1–4 weeks
2 9.1%
Over a month
10 45%

How the animals did

Recovered
10 26%
Still unwell when reported
13 33%
Died
3 7.7%
Euthanised
7 18%
Not known
6 15%

Problems reported at the same time

19 49%
Liver problems
12 31%
Weight loss
10 26%
10 26%
Kidney problems
9 23%
Diarrhea
8 21%
Weakness
7 18%

Age of the animals

Under 1 year
0
1–3 years
1
4–7 years
3
8–11 years
13
12+ years
22

About this medicine

Type: medicine.

Questions owners ask

Can Theophylline cause lethargy in dogs?
39 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 28 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).

Lethargy with similar medicines

All reported side effects of Theophylline in dogs · Medicines most reported with lethargy