Trichomoniasis can be cured with a single dose of antibiotics, and most people start feeling better within a few days. But “going away” depends on what you mean: symptom relief, the parasite actually leaving your body, and testing negative all happen on different timelines.
Treatment Options: One Day or Seven
There are two standard approaches. The first is a single large dose of antibiotics taken all at once. The second is a lower dose taken twice daily for seven days. Both are highly effective, and which one your provider prescribes may depend on your symptoms, health history, or whether you’re pregnant. The seven-day course tends to clear the parasite slightly faster, though either option works for most people.
When Symptoms Improve
Symptoms like discharge, itching, burning, and discomfort during urination typically start improving within a few days of your first dose. That said, “improving” and “gone” aren’t the same thing. Some lingering irritation for a week or so is normal as your body recovers from the inflammation the parasite caused. If your symptoms haven’t improved at all after a week, contact your provider, because it could signal treatment failure or reinfection.
When the Parasite Actually Clears
Even after symptoms fade, the parasite itself takes longer to fully leave your body. A study tracking women after treatment found that the median time to a negative test was about 8 days, with a range of 6 to 28 days. At the two-week mark, roughly 91% of women tested negative. By three weeks, that number climbed to nearly 97%, and by four weeks, every participant had cleared the infection.
The seven-day course cleared the parasite a bit faster than the single dose. All women on the multi-dose regimen tested negative by day 21, while the single-dose group took until day 28 for everyone to clear. In practical terms, you can expect the infection to be fully gone within two to four weeks, even though you’ll likely feel fine much sooner.
When to Get Retested
The CDC recommends retesting about three months after treatment, even if your partner was also treated. This isn’t because the medication takes that long to work. It’s because reinfection is common, and testing too early can produce misleading results. Sensitive lab tests can pick up leftover genetic material from dead parasites for weeks after successful treatment, potentially giving you a false positive. Waiting three months ensures that a positive result means an actual active infection rather than harmless remnants.
If your provider uses a standard lab test (nucleic acid amplification testing), retesting before three weeks on the multi-dose regimen or four weeks on the single dose risks an inaccurate result.
The Seven-Day Wait Before Sex
You should avoid sex for at least seven days after both you and your partner finish the full course of medication. Not just seven days after your dose, but seven days after the last person finishes treatment. If you have sex before that window closes, use a condom. The parasite can pass back and forth between partners, and having sex too soon is one of the most common reasons people end up with trich again shortly after treatment.
Why Partner Treatment Matters
Trich won’t truly “go away” if your sexual partner still carries the parasite. Because trichomoniasis often causes no symptoms, especially in men, your partner may not realize they’re infected. If only one person gets treated, reinfection during the next sexual encounter is almost guaranteed. Your partner needs to be treated at the same time you are. Some providers offer what’s called expedited partner therapy, where they prescribe medication for your partner without requiring a separate office visit. This can speed up the process and reduce the gap between your treatment and theirs.
What Happens If Treatment Doesn’t Work
For a small number of people, the first round of antibiotics doesn’t fully clear the infection. This can happen because of drug resistance, which is usually low-level, meaning a different antibiotic or a higher dose can still work. If you were initially treated with a single dose and symptoms persist, your provider will typically try the seven-day course next, or switch to a different medication in the same drug class.
True treatment-resistant trichomoniasis is rare, but it does exist. Options beyond the standard medications are limited, and cases like these sometimes require consultation with a specialist. The key is not to ignore symptoms that stick around. Persistent or recurring trich isn’t just annoying. It increases vulnerability to other sexually transmitted infections and can cause complications during pregnancy.
Timeline Summary
- Symptom relief: within a few days of starting treatment
- Parasite clearance: most people clear the infection within 1 to 2 weeks, with everyone clearing by 4 weeks
- Safe to have sex: 7 days after both you and your partner finish medication
- Retest to confirm cure: 3 months after treatment