Does one dose of Doxycycline have a preventive effect after a tick bite?

In the case of a tick bite infected with Lyme disease, you should undergo the full treatment regimen prescribed by your doctor. More information : https://www.gdziepolek.pl/artykuly/borelioza-po-ukaszeniu-kleszcza

You can also report the tick to a point that checks for the presence of pathogens.

Taking one antibiotic tablet will not affect the potential course of the disease. Such solutions are inadvisable from the pharmacological point of view due to the development of bacterial resistance to a given antibiotic.

If you have any doubts, I encourage you to use the telemedical consultation:

https://www.gdziepolek.pl/telekonsultacja