Male urethritis: gonococcal or not?

Differentiation between gonococcal and nongonococcal urethritis may be suspected on clinical grounds but must be proven by the absence of gonococci on smear and culture of the discharge. Chlamydia may be the most common etiological agent in NGU but other causative factors are still unclear. Tetracycline hydrochloride is effective treatment in most instances of GU and NGU.