Chlamydia Treatment: What Works, How Long It Takes, and What to Expect

You just got a positive chlamydia test, and your head is spinning. Maybe you have no symptoms at all and are wondering how this happened. Take a breath: chlamydia is one of the most common infections doctors treat, and it is also one of the most curable. A short course of antibiotics clears it in almost everyone.

This guide walks you through exactly what chlamydia treatment looks like today, how long it takes to work, what to do about your partner, and when you need to get checked again.

What is the treatment for chlamydia?

Chlamydia is treated with antibiotics, and the cure rate is very high. The CDC's first-line treatment for uncomplicated urogenital chlamydia is doxycycline 100 mg taken by mouth twice daily for 7 days. The recommended alternative is azithromycin 1 g taken by mouth as a single dose.

Both are prescription antibiotics that target the bacteria responsible, Chlamydia trachomatis. Your clinician chooses between them based on your situation, including whether you are pregnant, where the infection is located, and how confident you are that you can finish a multi-day course. This is general education, not a prescription; the right regimen and dose are decisions for a licensed clinician who knows your history.

Doxycycline vs. azithromycin: why the guidelines changed

For years, a single dose of azithromycin and a 7-day course of doxycycline were considered equally good first choices. That changed with the 2021 CDC STI Treatment Guidelines, which now name doxycycline as the preferred regimen. In the prior 2015 guidelines, the two were listed as co-equal first-line options.

The shift was driven by head-to-head research showing doxycycline clears the infection slightly more often. In a New England Journal of Medicine trial of urogenital chlamydia, doxycycline showed 100% efficacy versus 97% for azithromycin. The difference was far larger for rectal infections: another NEJM trial found a microbiologic cure of 100% with doxycycline versus only 74% with single-dose azithromycin, a 26 percentage-point gap.

Azithromycin still has an important role. It remains the preferred option in pregnancy and a reasonable choice when finishing a full week of pills would be difficult, since a single observed dose removes any adherence concern.

How long does chlamydia treatment take to work?

The antibiotics begin attacking the bacteria right away, but you are not considered fully treated the moment you take your first pill. Timing matters, both for clearing the infection and for not passing it back and forth with a partner.

Here is the general timeline to keep in mind:

• Single-dose therapy (azithromycin 1 g): abstain from sex for 7 days after the dose.
• 7-day therapy (doxycycline): take every dose, and abstain until you finish the full course and symptoms have resolved.
• Partners: do not resume sex until all partners have also been treated, which helps prevent reinfection.
• Symptoms, if you had any, usually ease within the first several days as the infection clears.

Treating chlamydia during pregnancy

Chlamydia in pregnancy is treated, but the medication choice is different. Doxycycline is contraindicated in the second and third trimesters because of a risk of fetal tooth discoloration. Instead, azithromycin 1 g as a single dose is used.

Pregnancy is also one of the few situations where a follow-up test to confirm the infection is gone, called a test-of-cure, is recommended, typically about 4 weeks after treatment. If you are pregnant and have been diagnosed, your obstetric clinician will guide both treatment and the follow-up testing schedule.

Do I need to get retested after treatment?

For most non-pregnant people, a routine test-of-cure is not necessary because the antibiotics are so effective. What the CDC does recommend is retesting roughly 3 months after treatment. This is not because the original infection lingers, but because reinfection from an untreated or new partner is common.

Treating your partners is the other half of staying cured. Even after a perfect course of antibiotics, you can catch chlamydia again from a partner who was never treated. Make sure everyone involved gets evaluated and treated before you resume sex.

When to see a doctor

Chlamydia frequently causes no symptoms at all. Most infections are silent, which is why under half of the estimated annual infections are ever diagnosed. That makes routine STI screening, not symptoms, the main way it gets caught. If you are sexually active and due for screening, or a partner tells you they tested positive, get tested even if you feel completely fine.

See a clinician promptly if you have pelvic or testicular pain, fever, unusual genital discharge, bleeding between periods, or pain during sex. Untreated chlamydia can spread and cause serious problems like pelvic inflammatory disease. The good news is that getting tested and treated is straightforward, and clinician-overseen telehealth services, including Nolla, can make starting that conversation easier.