there is a short course of antibiotics that works for prevention after a tick bite
the last time i had an embedded tick, i researched this a bit and found that a single dose of doxycycline was sufficient AT THAT STAGE.
just a rash does not make lyme disease. its frequently both over and under diagnosed.
the no sun warning is for photosensitivity from the tetracyclines. it does not happen to everyone who takes them...but it did happen to me (not from the single dose, but an earlier different problem)and it was severe.