RCT: Doxycycline better than Azithromycin for the treatment of rectal Chlamydia in men who have sex with men. 1 Oct, 2021 | 10:09h | UTC Doxycycline Versus Azithromycin for the Treatment of Rectal Chlamydia in Men Who Have Sex With Men: A Randomized Controlled Trial – Clinical Infectious Diseases Related: RCT: Doxycycline for 7 days superior to single-dose azithromycin for the treatment of rectal chlamydia infection.