Weight loss after Doxycycline in dogs

207 reports to the FDA describe weight loss in dogs given Doxycycline. That is 5.2% of all reports for this medicine, compared with 1.7% across reports for all dog medicines, so it is reported unusually often with this medicine.

207Reports

69%Marked serious

6.3%Recovered

28%Died or euthanised

25 daysTypical onset

How soon it started

Same day

15 9.6%

1–2 days

14 8.9%

3–7 days

19 12%

1–4 weeks

33 21%

Over a month

76 48%

How the animals did

Recovered

13 6.3%

Still unwell when reported

97 47%

Died

19 9.2%

Euthanised

38 18%

Not known

40 19%

Problems reported at the same time

116 56%

90 43%

74 36%

63 30%

60 29%

58 28%

40 19%

40 19%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Doxycycline treats bacterial and tick-borne infections.

Questions owners ask

Can Doxycycline cause weight loss in dogs?: 207 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 25 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).

Weight loss with similar medicines

Weight loss after Amoxicillin + Clavulanate (Clavamox) 249 reports · 4.6% of its reports
Weight loss after Cefovecin (Convenia) 167 reports · 4.4% of its reports
Weight loss after Enrofloxacin (Baytril) 186 reports · 4.9% of its reports
Weight loss after Metronidazole 265 reports · 8.6% of its reports
Weight loss after Amoxicillin 113 reports · 8.4% of its reports

All reported side effects of Doxycycline in dogs · Medicines most reported with weight loss