Which regimens are used to treat Chlamydia infections?

• A. Amoxicillin
• B. Doxycycline
• C. Azithromycin
• D. All of the above

Answer: (D)

Chlamydia infections require antibiotics that can reach and act inside the cells where the organism lives. Doxycycline is commonly used in nonpregnant patients because a 7-day course (about 100 mg twice daily) reliably clears the infection. Azithromycin offers a convenient alternative with a single-dose regimen (about 1 g), which can improve adherence and is effective for uncomplicated cases. Amoxicillin is another option, especially when doxycycline isn’t suitable—most notably in pregnancy (and in certain situations where tetracyclines are contraindicated)—typically given for about a week. Because patient factors like pregnancy status and adherence influence choice, all three regimens are used to treat Chlamydia infections.