I can only say that after I got bit by a tick about
4 weeks ago,I decided to take Doxy, just in case.
I was terrified that I was going to get reinfected.....within 24 hours,my neck was killing me,so I stopped after 3 days,unfortunately my doctor was on holiday so I couldn't ask for advice.
The neck pain disappeared 24 hours later,why ? I have absolutely no idea,but it hasn't come back.
I had a very bad time with Doxy the first time,I guess it just doesn't agree with me.