When I got Lyme as a teenager I was very lucky to notice a bulls-eye pattern (which not everyone gets) and quickly get treatment, with no complications after. I wonder if this new drug, or any future drugs, that work for the 20% of the people that doxycycline doesn't help, will also help people who figured out they had Lyme very late after being infected.
I got the regular treatment and it all cleared up, but it was an odd experience.