I took 2 same treatment for clam in last 2 wks azitro 1 dose 4 tabs 1 g also did 2 nd urine for clam after 1st dose neg still burning of penis etc canned that second test be a false negative and do i need to return to go on the third antibiotic for this

Doubt chlamydia: Did you have a positive lab test for chlamydia before treatment? Chlamydia is rare in men your age (45), azithromycin is always effective, and chlamydia rarely causes burning without dischrage. Sounds like a different problem, perhaps a prostate problem, pelvic pain syndrome, or non-STD urinary tract infection. Azithro doesn't work for these. See a urologist or infectious disease specialist.