Didn't stop ticks after Doxycycline in dogs

The FDA has received 47 reports of didn't stop ticks in dogs after Doxycycline. That is 1.2% of all reports for this medicine, compared with 2.3% across reports for all dog medicines, so it is reported less often than average with this medicine.

47Reports

34%Marked serious

4.3%Recovered

15%Died or euthanised

45 daysTypical onset

How soon it started

Same day

0 0.0%

1–2 days

4 13%

3–7 days

2 6.7%

1–4 weeks

7 23%

Over a month

17 57%

How the animals did

Recovered

1 2.1%

Recovered with lasting effects

1 2.1%

Still unwell when reported

13 28%

Died

2 4.3%

Euthanised

5 11%

Not known

25 53%

Problems reported at the same time

Didn't work as expected

17 36%

10 21%

10 21%

9 19%

7 15%

7 15%

6 13%

6 13%

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 didn't stop ticks in dogs?: 47 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 45 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).

All reported side effects of Doxycycline in dogs · Medicines most reported with didn't stop ticks