ZMax was probably given to treat chlamydia. However, if that was the case, that is not the right forumlation to treat this. The standard 4 pill dose of Zithromax is normally needed to treat chalmydia.
You should be tested with either a urine sample or urethral swab to look for STDs.
Prostatitis should also be considered, and can be evaluated with a digital rectal exam as well as urine testing.
If infection has been ruled out, you can consider a cystoscopy to look for anatomical causes of the pain (i.e. either a urethral stricture or urethral polyp).
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_b