What is a commonly used antibiotic to treat chlamydia?

Azithromycin is one of the most commonly prescribed antibiotics for the treatment of chlamydia, often given as a single dose of 1 gram. This single-dose regimen is particularly appealing for its convenience and effectiveness. Doxycycline is another recommended option, typically prescribed at 100 mg twice a day for seven days, and is also effective against chlamydia. Levofloxacin can be used as well and prescribed at 500 mg daily for seven days, although it's not the first-line therapy.

The inclusion of all these options demonstrates that multiple effective treatments exist for chlamydia. Each antibiotic regimen has its specific indications and may be chosen based on patient circumstances, adherence concerns, and potential allergies. Thus, recognizing that all the provided regimens can be effective in treating chlamydia supports the rationale for selecting the answer that encompasses all three choices.