Uncomplicated chlamydia infection in a pregnant woman should be treated with a single 1,000-mg oral dose of azithromycin. An acceptable alternative is amoxicillin 500 mg orally 3 times daily for 7 days.
In a nonpregnant patient, doxycycline 100 mg orally twice daily for 7 days is also an appropriate alternative. However, doxycycline is relatively expensive and may not be well tolerated because of gastrointestinal adverse effects. (Workowski KA, Bolan GA. Sexually transmitted diseases treatment guidelines, 2015. MMWR Morbid Mortal Wkly Rep. 2015;64[RR3]:1-137.)