Which agents are first-line for treating Chlamydia trachomatis and Mycoplasma genitalium infections in adults?

Which agents are first-line for treating Chlamydia trachomatis and Mycoplasma genitalium infections in adults?

• A. Ciprofloxacin or levofloxacin.
• B. Azithromycin or doxycycline.
• C. Amoxicillin or cephalexin.
• D. Clindamycin or metronidazole.

Answer: (B)

Treating these intracellular genital pathogens requires drugs that penetrate host cells and act effectively inside them. Azithromycin and doxycycline both achieve strong intracellular concentrations and are proven to cure infections caused by Chlamydia trachomatis and Mycoplasma genitalium, making them the standard first-line choices for adults. For Chlamydia trachomatis, a one-time dose of azithromycin or a 7-day doxycycline course are conventional first-line regimens. For Mycoplasma genitalium, doxycycline is widely recommended as initial therapy because it offers reliable cure rates, while azithromycin can be used in settings with low macrolide resistance, though its effectiveness may be reduced by resistance. Other options—such as fluoroquinolones, or agents like amoxicillin, cephalexin, clindamycin, or metronidazole—do not reliably treat these intracellular organisms and are not considered first-line.

Treating these intracellular genital pathogens requires drugs that penetrate host cells and act effectively inside them. Azithromycin and doxycycline both achieve strong intracellular concentrations and are proven to cure infections caused by Chlamydia trachomatis and Mycoplasma genitalium, making them the standard first-line choices for adults. For Chlamydia trachomatis, a one-time dose of azithromycin or a 7-day doxycycline course are conventional first-line regimens. For Mycoplasma genitalium, doxycycline is widely recommended as initial therapy because it offers reliable cure rates, while azithromycin can be used in settings with low macrolide resistance, though its effectiveness may be reduced by resistance. Other options—such as fluoroquinolones, or agents like amoxicillin, cephalexin, clindamycin, or metronidazole—do not reliably treat these intracellular organisms and are not considered first-line.