Blood problems after Doxycycline in cats

61 reports to the FDA describe blood problems in cats given Doxycycline. That is 24% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

61Reports

82%Marked serious

11%Recovered

49%Died or euthanised

7 daysTypical onset

How soon it started

Same day

8 15%

1–2 days

11 21%

3–7 days

8 15%

1–4 weeks

18 34%

Over a month

8 15%

How the animals did

Recovered

7 11%

Still unwell when reported

20 33%

Died

8 13%

Euthanised

22 36%

Not known

4 6.6%

Problems reported at the same time

34 56%

31 51%

30 49%

23 38%

20 33%

19 31%

Didn't work as expected

12 20%

Leucocytosis

11 18%

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 blood problems in cats?: 61 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 7 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).

Blood problems with similar medicines

Blood problems after Cefovecin (Convenia) 780 reports · 9.0% of its reports
Blood problems after Amoxicillin + Clavulanate (Clavamox) 128 reports · 5.4% of its reports
Blood problems after Enrofloxacin (Baytril) 66 reports · 4.2% of its reports
Blood problems after Metronidazole 24 reports · 6.1% of its reports

All reported side effects of Doxycycline in cats · Medicines most reported with blood problems