dear mikie, a short while back I had a post about my mycoplasma infections (2) and hhv6...I had said I still was so sick. I stated that I took 100 mg. of doxycycline per day for it. you had said you take 200 mg. per day.My question is how long have you been on that dose and have you had any problems with your kidneys from it? does your dr. test you for kidney function? I had one dr. tell me not to take that dose because of possible kidney problems from it. I want to go on and try it, just wanted to hear from someone who has been on it for awhile and their experiences....I do not have a history of any kidney problems....do you feel better on that dose? I have been taking it for 2 years and cant go off it or I get very sick but dont feel well enough on what iM taking...thankyou for any input you might have from your experience with the drug...Ive been on famvir for the hhv6 (dont remember if you have that) and dosent seem to help...wrote to herpes diognostics (Edited to remove URL) and they said famvir and zovirax were ineffective..they suggested transfer factor...Im a little leary of taking it...real sensitive to many meds...dont know where to go from here.....sorry to go on so long....I am 57 and live in florida also, near clearwater...thanks again...love jan a.