Tetracycline and minocycline in the management of non-gonococcal urethritis: a comparison.

A clinical trial compared the relative efficacy of tetracycline hydrochloride 250 mg qid and minocycline hydrochloride 100 mg bid given for an initial period of ten days to 59 patients suffering from non-gonococcal urethritis (NGU). Those patients with persistent symptoms or signs on completion of the initial course were given a second course for a further ten days at the same dosage. The treatments were equivalent. A significant number of patients not clinically cured after one course of treatment responded satisfactorily to a second course.