Hi everyone, I saw the Infectious Disease Doctor today and am finally getting tested for co-infections. Although the doxycyline was working for three months or so, the past 10 days I have been getting much worse. Next Monday or Tuesday I am going to get the PICC line inserted and start IV Rocephin. I read that if you have penicillin allergies then you may have a bad reaction to Rocephin. I was wondering if anyone has had experience in this area. Since I am allergic to penicillin, I am a bit worried.