A quick caution: ff you're planning on climbing in the Frankenjura or the Czech republic and get bitten by ticks, there's also the possibility of Tick Borne Encephalitis.
It turns out that my body does not like doxycycline at all. Rash, fever, stomach cramps, headaches. So I stopped taking it yesterday. Going to see how I feel over the next week, and then make a decision.
I still swear by the TickTwister)