Is it bad to take doxycycline if i don't need it? i was bitten by a tick and have no symptoms. scared of getting sick, but also scared that a strong antibiotic will be harmful if i'm not sick?

Inside the gut and on the bodies surface we has a balance of various germs that live in harmony. When a bad germ invades either site we get sick. When you take an unnecessary antibiotic, you kill off otherwise benign germs and begin to select out antibiotic resistant strains. When you have a diagnosed condition, it is worth it, if not you add pressure to create new resistant germs.