Chlamydia is cured with a short course of antibiotics, and the standard treatment clears the infection in about a week. Most people take a twice-daily antibiotic for seven days, though a single-dose option exists for certain situations. It’s one of the most straightforward sexually transmitted infections to treat, but finishing the full course and following up correctly matters more than most people realize.
The Standard Antibiotic Regimen
The first-line treatment for uncomplicated chlamydia is a seven-day course of an antibiotic taken twice daily. This has been the preferred approach for years because it consistently produces high cure rates. The medication works by blocking the bacteria’s ability to build new proteins, which stops them from multiplying. Without the ability to reproduce, the remaining bacteria die off over the course of treatment.
A single-dose antibiotic taken all at once used to be considered equally effective, but clinical experience has shifted the preference toward the seven-day regimen for most patients. The longer course gives the drug more sustained contact with the bacteria, which is particularly important because chlamydia has an unusual life cycle. The bacteria alternate between an active, dividing form inside your cells and a dormant, non-dividing form. A single dose may not catch all the bacteria during their vulnerable phase, while a week of treatment covers multiple cycles.
What Happens During Treatment
You take the antibiotic orally, no injections or hospital visits required. Side effects are generally mild: some people experience nausea, stomach upset, or sensitivity to sunlight. Taking the medication with food helps reduce stomach discomfort.
You should avoid sexual contact for seven days after starting a seven-day course, or for seven days after taking a single-dose treatment. This waiting period prevents you from passing the infection to a partner before the bacteria are fully cleared. If you have sex too soon, you risk reinfecting your partner or being reinfected yourself.
Most people feel no different during treatment because chlamydia often causes no symptoms in the first place. Up to 70% of women and 50% of men with chlamydia have no noticeable symptoms, which is why testing is the only reliable way to know if you have it and whether treatment worked.
Treatment During Pregnancy
Pregnant individuals receive a different antibiotic because the standard seven-day drug isn’t safe during pregnancy. The CDC recommends a single oral dose as the primary option, with a seven-day course of a pregnancy-safe alternative available if needed. Treating chlamydia during pregnancy is critical because the infection can pass to the baby during delivery, potentially causing eye infections or pneumonia in newborns.
Why Follow-Up Testing Matters
The CDC recommends retesting three months after treatment. This isn’t because the antibiotics failed; it’s because reinfection is common. If your partner wasn’t treated, or if you have a new partner who carries the infection, you can get chlamydia again right away. Curing chlamydia once does not give you any immunity to future infections.
A “test of cure,” meaning a test specifically to confirm the antibiotics worked, isn’t routinely needed for most people. But retesting at three months catches the repeat infections that frequently occur, especially in younger adults. If you do test positive again, the same antibiotic regimen works. Chlamydia has not developed meaningful antibiotic resistance, so retreatment with the standard course is effective.
Your Partner Needs Treatment Too
Curing chlamydia in yourself while your sexual partner remains untreated is a temporary fix. You’ll likely be reinfected the next time you have unprotected sex. Any partner you’ve had sexual contact with in the 60 days before your diagnosis should be tested and treated.
When a partner can’t or won’t visit a clinic, a practice called Expedited Partner Therapy allows your healthcare provider to write a prescription for your partner without examining them directly. You pick up the medication and deliver it to your partner yourself. The CDC considers this a useful option, particularly for male partners of women diagnosed with chlamydia. EPT is legal in most U.S. states, though the rules vary by location.
What Happens If Chlamydia Goes Untreated
Left untreated, chlamydia doesn’t resolve on its own. The bacteria continue to live and replicate inside the cells lining the reproductive tract, and the longer the infection persists, the greater the risk of serious complications.
About 10 to 15% of women with untreated chlamydia develop pelvic inflammatory disease, an infection of the uterus, fallopian tubes, or ovaries. PID can cause chronic pelvic pain, scarring of the reproductive organs, and infertility. Even a single episode of PID increases the risk of ectopic pregnancy, where a fertilized egg implants outside the uterus.
In men, untreated chlamydia can spread to the tube that carries sperm, causing pain and swelling. In rare cases, this leads to fertility problems. For both sexes, an active chlamydia infection also makes it easier to contract or transmit HIV if exposed.
How Quickly the Cure Works
The antibiotics begin killing bacteria within hours of your first dose. By the end of a seven-day course, the infection is cleared in the vast majority of cases. However, any damage already done to reproductive tissue, such as scarring from PID, is not reversed by antibiotics. Treatment eliminates the infection but doesn’t undo complications that developed before diagnosis. This is the strongest argument for routine screening, especially for sexually active women under 25, who carry the highest rates of infection and are most vulnerable to long-term reproductive harm.